442 
INDEX. 
Bithynia tcntaculatu, foriii 24, jaws 
2o2, male organs 361, operculum 
123, segmentation of ovum 380. 
Bivalve (see Pelecypoila). 
Blastoco'l 3S1. 
Blastopore 245, 381. 
Blastula (see Morula). 
Blood 139, 294- 
Blood-sinus of lung 30o. 
Body, region 136, of Anodonta 166, of 
Helix 146, 204, whorl 26. 
Branchim 301. 
British Isles, fauna of 401, pi. vi. 
“Brush” sensory cells 170. 
Branchiopneusta, defined 9. 
Branchia' 301. 
Buccal armature, preparation of 272, 
staining 273. 
Buccal bull)247, co-ordination of arma- 
ture 249, gastropods 342, euthyneura 
‘25d,Ar/riolima.c arjrcstis, section 269, 
Tcatacclla haliotidea, section 266, 
Linutx cinereo -niijer 243, Cyclo- 
stoma clcgans 247, Helix as/icrsa 
152, streptoneura, section 248, pro- 
tractors 247, 259, retractors 159, 247, 
259, 342,344, levators depressors 
259, 342, extrinsic muscles 153, 158, 
159, 258, intrinsic muscles 153, 159, 
259. 
Buccal ganglia 137, gastropoda 149, 
213, 219, pelecypoda 170, 216, 219. 
Buccal salivary glands 275. 
Buccin urn und((tum,ner\ons system223 
Bidim in us monta n us, sex u al organs 36 1 . 
Button making 4-9. 
Byssal gland 197, 316, 320, byssal fur- 
row, section 321. 
Byssus 321, attachmentof 321, glochi- 
dial 322. 
Cwcilioides acicula, form 24, trunca- 
tion of columella 30. 
Calcai'eous cells 140, 17S. 
(’alcic glands 323. 
Caliculation 43. 
Cambrian strata 405. 
Cancellate sculpture 28. 
Capillaries 293. 
Capping (see Caliculation). 
Cai)reolus (.see Spermatoj)hore). 
Carboniferous, fossils 4O6, strata 405. 
Cardinal teeth 46, 47. 
Carinate, univalve 28, periphery 31. 
Canjchiuni minimum, absorption of 
columella 29, aperture 34. 
Caudal, gland 192, 197, 314, 319, vesicle 
.381. 
Celtic province of British Isles 402,pL vi. 
Cement 430. 
Central, radular area 260, teeth 152, 261. 
Cephalic, region 135, of Helix aspersec 
185, 188, eyes 138, in Anodonta 171, 
in gastropods 230, 231, lobes 193, 
margin 37, tentacles 187, 188, 189. 
Cephalic retractors, 342, Amalia ga- 
gates 342, Avion suhfuscus 344, 
Limax maximus 344, Limncca pere- 
gra 343, Helix aspersa 159. 
Cephalic ganglia (see Cerebral ganglia) 
Ceratoid univalve 26. 
Cerebral ganglia 137, 213, 216, axis of 
cells of 210, cells of, in Anodonta 
anatina 217, Anodonta cygnea 168, 
Helix aspersa I47, 148, styiommato- 
phora 217, pelecypoda 217. 
Cerebro-pleural, connectives 76’9, gang- 
lia 168. 
Chambers, anterior and posterior of 
bivalves 40. 
Chaperon 186. 
Chemical structure of univalve shells 
20, of pelecypod shells 38. 
Chemical defences of plants 288. 
Chiastoneura (see Streptoneura). 
Chitin cells I40. 
Circulatory system 139, in Anodonta 
173, 174-177, in Helix aspersa 155, 
156, 289. 
Cingulate univalve 28. 
Circular aperture 33. 
Classification 4, literature 13, alimen- 
tary canal 284, egersidia 365, mus- 
cular system 10, 20, 342, teeth 264, 
sexual organs 351, table of 11. 
Clau.nl ia, clausium 127, causes of folds 
68, lime scarcity, effect on form 77, 
nomenclature of oral folds 67, 68, 
odour from 230. 
Clausilia hidentata, abnormal growth 
121, clausium 126, distomate and 
cause of distomatism 119, section of 
shell 128. 
v.jmrvida 73, v. sep)tentrionalis 73 
Clausilia ei'avencnsis, clausium of 127. 
Clausilia laminata, form of shell 24, 
form of aperture 33, clausium 128, 
section of shell 29. 
Clausium or Clausilium 127, 128. 
Claw of Helix 160, 161, 359. 
Clear water, effect on colouring 87. 
Climate, effect of 84. 
Clitoris 365. 
Close bivalve 41. 
Cochleare or Roman spoons 425. 
Cochlearia 434- 
Cold, intliience on colour 329, on size 
82, on growth 82, on thickness 83. 
Colouring 49, adaptive 92, adventitious 
88, distribution on shell 40, 50, in 
gastropods 88, procyptic 87, struc- 
tural or prismatic 86, of peristome 
89, zones of 85, effect of age on 328, 
of clear water 87, of cold 329, of food 
91, of heat 330, of light 85, 87, of 
turbid ■water 88. 
Colour receptacles 439. 
