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133. Physa fontinalis

134. Conovulus denticulatus

135. Snail and shell of Carychium minimum

136. Ancylus fluviatilis

137. Conovulus denticulatus, var. myosotis .

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143. Snail of Valvata cristata, much enlarged

144. Snail of Acme fusca, much enlarged.

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INDEX.

Technical terms are in italics, and will be found explained
at pages to which references are given.

A.

ACHATINA ACICULA, 171; pulsations of the heart of, 172;
subterranean habits of, ib.

Acme fusca, 223; how to secure, ib.

Adductor muscles of bivalves, 18.

Agate snails, 171.

Air-breathing snails, 65; relation of, to water-breathing

snails, ib.; orders of, ib.

Alasmodonta margaritifera, 27.

Amber snails, 174.

Amphipeplea genus, 186.

glutinosa, 196.

involuta, 198.

Amphistoma subclavatum, parasite of Cyclas, 35.

Anal opening in bivalves, 14.

Ancylus genus (fresh-water limpets), 205.

fluviatilis, 206; respiration in, 207; parasite of, 208.

lacustris, 208.

oblongus, 208.

Animal kingdom, primary divisions of, 1.

Annulose animals, 2.

Anodon anatinus, 31.

cygneus, 30; varieties of, 31; mite of, 32.

Anterior margin, 10.

Aplexa hypnorum, 203.

Arion ater, 69; parasites on, 70; internal organs of, ib.
hortensis, 71; jaw of, ib.; phosphorescent eggs of, ib.
Assiminia Grayana, 63; teeth of, ib.

Atax ypsilophora, mite of the Swan mussel, 32.
AURICULIDE (family), 177.

Avicula margaritifera, pearls of, 28.

Azeca tridens, 152.

B.

BALEA PERVERSA, 164.

Bithinia Leachii, 57.

tentaculata, 56.

Bivalves, parts of shell of, 10-13; composition and structure
of shell of, 11; mantle of, 13; digestive organs of, 14;
circulatory apparatus of, 15; respiratory organs of, ib. ;
nervous system of, 17; organs of sense of, ib. ; muscular
organs of, ib.; reproduction of, 18; food of, 19; col-
lecting, ib.

Branchial opening in bivalves, 14.

Breadth of shell, 11.

Bubble snails, 201.

Bulimus genus, characters and species of, 146.

acutus, 147.

montanus, 148.

obscurus, 149.

Byssus, nature of, 21.

C.

CADDIS-WORM case like Valvata piscinalis, 59.

Cardinal teeth, 12.

Carychium minimum, 177.

exiguum, 178.

Chrysalis snails, 152.

Circulatory system of bivalves, 15 ; in univalves, 52.

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