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FIG.
68. Snail and shell of Helioc ericetorum
69. Helic pulchella, var. costata

» Cartusiana

» pygmæea. 72. » revelata . . . .

Pomatia . . rotundata . hispida . rufescens . . concinna .

caperata . . . . 79. » lapicida . . . .

, virgata : .

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PLATE IX. to face page 168. 81. Bulimus montanus. .. 82. , obscurus . . . 83. , acutus . . 84. Zua lubrica 85. Azeca tridens . . 86. Balea perversa. . 87. Clausilia laminata 88. Vertigo alpestris 89. Achatina acicula 90. Vertigo pygmæa. 91. Clausilia rugosa . 92. . var. dubia . 93. , Rolphii . 94. Animal of Clausilia . . 95. Clausilia biplicata 96. Pupa secale .

. . . . 97. „ umbilicata . 98. , muscorum 99. , Anglica . . . . .

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PLATE X. to face page 186.
FIG,
100. Vertigo minutissima . . . .
101. , edentula . . . .
102. , pusilla . .
103.

antivertigo .
104. , substriata . . . .
105. „ Moulinsiana . .
106. Succinea putris . .
107. Snail and shell of S. elegans
108. Planorbis contortus, .
109. Succinea oblonga . .
110. Limnæa truncatula . .
111. Vertigo angustior ..
112. Physa hypnorum ..
113. Limnæa palustris .
114. , stagnalis . . . .
115.

glabe . .

peregra, var. Burnetti
117. peregra . . .
118.

2 var. ovata
119. , auricularia . .
120. Planorbis corneus . .
121, 122. Limnæa glutinosa .
123.

, involuta . . .
124. Planorbis nautileus . . . .

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PLATE XI. to face page 202.
125. Planorbis albus . . . . .
126. , glabe • • • •
127. , vortex . . . .

, marginatus
129. , spirorbis . . . .
130. , carinatus . . . .

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FIG.
131. Planorbis nitidus . . . . .
132. , lineatus .
133. Physa fontinalis . . . . .
134. Conovulus denticulatus ..
135. Snail and shell of Carychium minimum .
136. Ancylus fluviatilis . . .
137. Conovulus denticulatus, var. myosotis .
138. , bidentatus . . . .
139. Ancylus oblongus . . . . .
110. Cyclostoma elegans
141. Snail of Physa fontinalis .
142. Acme fusca . . . .
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.

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.
AURICULIDÆ (family), 177.
Avicula margaritifera, pearls of, 28.
Azeca tridens, 152.

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.

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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