INDEX. 
4.53 
Stylogania 357. 
Stylonimatophora 9, cerebral ganglia 
217, nervous system 214, otoconia 
239, retractors 3JS, tentacles 188. 
Stylopliore 358, 369, development 370, 
Helix aspersa 160, 162, H.ftisca, H. 
ifala, H. pomatio, and H. rufesccns 
370. 
Stylotheca 138, 172, Dreiasens'ia pohj- 
morpha 277, Donax 278. 
Sub-oesphageal ganglia 147, of gastro- 
poda 213. 
SuD-carinate periplieiy 31. 
Sub-equilateral bivalve 40. 
Sub-reptatory foot 195. 
Sub-rbomboidal bivalves 52. 
Subscribers, list of 436-9. 
Sub-species, defined 59, 60. 
Sub-spiral operculum 127. 
Substance of sliell 76, causes of varia- 
tion in 76. 
Subulate univalve 24. 
Sub-variety, defined 60. 
Succinea, penial retractor 344- 
Succinea degam, alimentaiy tract 282, 
sexual system 359. 
Succinea putris 9, dorsal grooves 205, 
eyes 231, fertilizing vesicle 375, jaw 
256, nervous sj’stem 215, position 
of nepliridium 334, scalariform 26. 
Sulcate sculpture 28. 
Superstitions 432. 
Supra-oesopliageal (see Cerebral gang- 
lia). 
Supra-pedal gland 226, functions 197, 
Helix 157, 196, 314, Limaxmaximm 
section Z\o,Testacella haliotidca 314. 
Surface, external and internal of bi- 
valves 41^- 
Suture 31. 
Sympathetic nerves 212. 
Symphynote bivalves 41. 
Synonymy IS. 
Tactile, sense 244, afferent and efferent 
nerves 244, mAnodonta 170, inHelix 
1.50. 
Tactile siphonal tentacles 244. 
Taste (see Gustatory sense). 
Tienioglossa 265, formula 265. 
Tectibrancli, parapodia of 193. 
Teeth, 152, development of 257,central 
1.52, lateral 152, mai’ginal 1.52, tran- 
sitional 152, 261. 
Temperature .jOc?, effect upon shells 76, 
82, 83, upon pigmentation 329. 
Tentacles, contractile 187, 188, 189, 
Cgclostoma 188, Limneva stognalis 
189, Planorhis marginatus 189, 
para vimpara 189. 
Tentacles, retractile 187, 188, 189, re- 
tractors 159, 342. 
Terete univalve 24. 
Terminal gut 246. 
Tertiary, period 409, shell, 322. 
Testacea 19. 
Testacella, ureter 336, musculature 344. 
Testacdlu scutulum, columella trun- 
cation 30. 
Testacella haliotidca 203, alimentary 
canal 246, 285, arrangement of teeth 
262, arterial system 293, buccal sec- 
tion 266, odontopliore 267, odon- 
tophoral formula 268, intestinal 
venous plexus 283, supra-pedal 
gland 314, 315. 
Tetragnatha 250. 
Tetraneura 209. 
Tetraspatliostyla 369. 
Tetronerythrine 195, 307. 
Teutonic province 402, pi. vi. 
Thermo-pulsatory curves of Helix 
granulata, H. rtifesccns, and Hya- 
linia cellaria 299, H. hortensis 298. 
Thermo-respiratory curves of Liiniura 
auvicularia, L. p>cregra, Planorhis 
eorneus 306. 
Time and growth-rate curve of Lim- 
neva stagnalis 81. 
Time and water-volume curve of 
Limna’a stagnalis 80. 
Temperature and water-volume cur\e 
of Limna;ci stagnalis 82, correlation 
with size 80. 
Tissue respiration 307. 
Torsion. 205, anisopleura 5, 6, 109, 
206, of internal organs 6, of intes- 
tinal canal 281, in pelecypoda 110, 
208, visceral nerves 221. 
Transition teeth 261. 
Transverse, aperture .33, bivalves 51, 
striation 27. 
Trapezoidal bivalve 52. 
Triassic strata 407. 
Trichorhiza 344. 
Trifoi'ate bivalve 198. 
Trignatha 250, 252. 
Triodroma 284. 
Trinomialism 17. 
Triangular bivalves 52. 
Trochosphere 34O, 381. 
Troclius, eyes of 2.32. 
Trochiform univalve (see Conoid). 
Truncate, columella 53, significance 
of 30, bivalve 5.3, anteriorly and pos- 
teriorly 53. 
Turbid waters, effect on colour 88. 
Turbinated univalves 24. 
Turhonilla rufa, heterostrophie spire 
115. 
Tumid bivalves 53, causes of tumidity 62 
Turreted univalves 24. 
Typhlosole 139, in Anodonta 171, 172. 
'173, 282. 
Umbilicus 28. 
Umbonal retentor muscles, Anodonta 
183. 
