APPENDIX. ART. L.—A New Family of Horned Dinosauria, from the Cretaceous; by O. C. MARSH. (With Plate XI.) DURING the past season, a special effort has been made by one field-party of the U. S. Geological Survey, to explore the Laramie formation, more particularly in Dakota and Montana. In this work, important collections of vertebrate fossils have been secured, and among them are remains of some new Dinosaurs of much interest, one of which is briefly described below. Ceratops montanus, gen. et sp. nov. The present genus appears to be nearly allied to Stegosaurus of the Jurassic, but differs especially in having had a pair of large horns on the upper part of the head. These were supported by massive horn-cores firmly coössified with the occipital crest. The latter are probably attached to the parietal bones, but, as the sutures in this region are obliterated, they may be supported in part by the squamosals. Their The horn-cores in the type specimen are sub-triangular at base, but nearly round in section in the upper half. position is represented approximately in the figures of the accompanying plate. These horn-cores are slightly hollowed at the base, but are otherwise solid. The exterior texture and markings show that they were evidently covered with true horns, and these must have formed large and powerful offensive weapons. In position and direction, these horn-cores are somewhat similar to the large posterior pair of protuberances in Meiolania, one of the extinct Testudinata, and to the corresponding ones of the existing Phrynosoma. The only known example of similar structure in the Dinosauria is the single median horn-core on the nasals of Ceratosaurus, from the Jurassic. It is not improbable that there were other horn-cores on the skull in the present genus, but, of this, there is at present no positive evidence. A detached median prominence resembling a horn-core was found with some similar remains, but may pertain to an allied genus. AM. JOUR. SCI.-THIRD SERIES, VOL. XXXVI, No. 216.-DEC., 1888. The resemblance.in form and position of the posterior horncores to those of some of the ungulate mammals is very striking, and, if detached, they would naturally be referred to that group. The basioccipital found in place with these horn-cores, and represented in plate XI (figures 1 and 2, 6), is much elongated, and formed the entire occipital condyle. Its exact position with reference to the horn-cores could not be determined. Teeth, vertebræ, and limb bones which probably belong to the present genus were all secured in the same horizon. They indicate a close affinity with Stegosaurus, which was probably the Jurassic ancestor of Ceratops. Among other remains referred to the present reptile, but not found with the type specimen, are some peculiar, large dermal plates, in pairs, that indicate a well-ossified armor. These plates show indications of being covered, in part at least, with scutes, as in turtles. Their position cannot at present be determined. The type specimen on which the present genus and species are based was found in place, in the Laramie deposits of the Cretaceons, in Montana, by Mr. J. B. Hatcher, of the U S. Geological Survey. Other specimens apparently pertaining to the same species were secured in the same horizon of the same region. Remains of the same reptile, or one nearly allied, had previously been found in Colorado, in deposits of about the same age, by Mr. G. H. Eldridge, also of the U. S. Geological Survey. The associated fossils found with the present specimens are remains of other Dinosaurs, crocodiles, turtles, and fishes, mostly of Cretaceous types. The mollusks in the same beds indicate fresh water deposits. The fossils here described indicate a reptile of large size, twenty-five or thirty feet in length, and of massive proportions. With its horned head and peculiar dermal armor, it must have presented in life a very strange appearance. The remains at present referred to this genus, while resembling Stegosaurus in various important characters, appear to represent a distinct and highly specialized family, that may be called the Ceratopsida. They will be described more fully in a later number of this Journal. Yale College, New Haven, Conn., November 23, 1888. EXPLANATION OF PLATE XI. FIGURE 1.-Horn-core and basioccipital of Ceratops montanus, Marsh; side view. a, horn-core; b, basioccipital. FIGURE 2-Horn-cores and basioccipital of same skull; posterior view. a, left horn-core; b, basioccipital; c, right horn-core. Both figures are one-fourth natural size. INDEX TO VOLUME XXXVI.* A Bennett, J. H., Plants of Rhode Island, 394. BOTANICAL WORKS NOTICED-American Woods, Hough, 160. Works of George - BOTANY Assimilation by colored leaves, En- Brigham, W. T., Mt. Loa in 1880, 33. C Calorimeter, ether, Neesen, 293. Chatard, T. M., analyses of alkali lake waters, CHEMICAL WORKS NOTICED-Chemical Analy- sis of Iron, Blair, 387. Modern Theories of Clarke, F. W., Constants of Nature, 303. Color photometry, Abney, 292. Crosby, W. O., Black Hills, Dak., 153. D Dana, E. S., Beryllonite, a new mineral, 290. Dame, L. L., Flora of Middlesex Co., Mass., 392. *This Index contains the general heads BOTANY. CHEMISTRY, GEOLOGY, MINERALS, OBITUARY, Day, D. F.. Catalogue of Plants near Niagara Day-light, penetration in water, Fol and Sara- Delgado, J. F. N., Bilobites, etc., de Portugal. Dodge, W. W., localities of fossils in Mass., Dumont, A., comparative anatomy of Malva- E Eakins, L G., two sulphantimonites, Col., 450. rier and Chappuis, 152; of water, von Electro-magnetic waves, interference, Fitz- Engelmann, G.. Botanical Works, 76. In permanent strains, Barus, 468. F Fluorescence, Walter, 67. G Galvanometers. mirror, mode of reading, Genealogical tree in paleontology, Judd, 154. 79, 389; American Report to, 469, 476a; Geological fund, Hayden memorial, 79. Geological Society, American, 294; London, Geological and scientific bulletin, 154. Alkali-lake waters, Chatard, 146. Archæan areas of N. J. and N. Y., Britton, Bilobites de Portugal, Delgado, 154. Calamites, fructification of, Williamson, 71. GEOLOGY- Cortlandt series, Williams, 254; extension Cretaceous Dinosauria, horned, Marsh, 477. Fauna of British India, Pt. I., Mammalia, Florida, structure of, Johnson, 230. Fossils in Mass., Dodge, 56, 476. Iron sulphides, decomposition of, Julien, 295. Manganese, deposits of, Dunnington, 175. Metamorphism, contact, near Peekskill, Paläophytologie Solms-Laubach, 72. 342. Soil from Wash. Terr., analysis, Schneider, Taconic, Dana, 410. Theoretische Geologie, Reyer, 389. Trias of N. J. and Conn. Valley, Fauna and Williamsonia angustifolia, Nathorst, 391. 472. Gravity, variations in Hawaiian Is., Preston, Gray, A., list of writings and index, Appendix. H Hall, E. H., effect of magnetic force on equi- notes, xenotime, 380; auerlite, 461; Hinman, R., Eclectic Physical Geography,303. I Iddings, J. P., origin of quartz in basalt, 208; Insect Life, new periodical Bulletin, 296. J Japan, volcanic eruptions in, 104, 293. Judd, J. W., Eruption of Krakatoa, 471. K Kemp, J. F., Rosetown extension of Cortlandt Kennelly, A. E., voltametric measurement of Keyes, C. R., sedentary habits of Platyceras, Kokscharow, N. von, Mineralogie Russlands, Kunz, G. F., mineralogical notes, 222; new L Langley, S. P., Energy and vision, 359; in- Le Blois, A., origin and development of ca- Lindgren, W., mineralogy of Pacific coast, 73. M Mackintosh, J. B., on auerlite, 461; on sul- Magnet, effect on chemical action, Rowland Marsh, O. C., new horned Dinosauria, 477. Merriam, C. H., fauna of Great Smoky Mts.; Merrill, G P., Fayette county meteorite, 113. Stone, Nowo-Urei, Russia, 74; Fayette Co, Texas, Whitfield and Merrill, 113. Meyer, L., Modern Theories of Chemistry, 60. Mineralogie Russlands, Kokscharow, 74. Moler, G. S., vibrations of cords, etc., 337. Munroe, C. E., effects of detonation of gun- N Natural History Society, New Brunswick, Newberry, J. S., Fauna and Flora of N. J. Newton, H. A., relation of orbits of meteor- Noë, G. de la, Les Formes du Terrain, 380. 0 OBITUARY-Chamberlin, Benjamin B., 396; Osborn, H. F., structure and classification of Owen, M. L., Plants of Nantucket, Mass., 393. |