INDEX. 



409 



of, 24. Cuvier's classification of, 

 5. Swimming, and fins of, 31. 

 Search for its prey, 34. High 

 organisation of, 38. Vestiges of 

 testaceous, 40. Affinities of, 48. 

 Extinct or fossil genera of, 48. 

 Their analogy with fishes, 51 ; 



" and with barnacles, 52. 



Ceratodes, sub-genus, 197. 339. 



Ceriphrasia, sub-genus, 204. Ano- 

 malous, 205. 342. 



Cerithidea, 198. 203. 342. 



Cerithinaa, or club-shells, 137. 139. 

 156. Characters of, 315. 



Cerithium, affinities of, 47. 136. 142. 

 205. Typical genus, 157. 315. 



Chama, how cemented or affixed to 

 rocks, &c., 32. 47. 374. 



Chamids, the, 257. 374. 



Chelidomus, analogies of, 192. 



Chelinotus, group of, 234. 355. 



Chelosomae, 36. Organisation of, 

 45.238. 255,256. 



Chiton, of Linnaeus, 357. 



Chitonellus, 246. 358. 



Chitones, or Cyclobranchia, 25. 55. 

 238, 360. Their organisation, 45. 

 Boat-shaped shells of, 58. Struc- 

 ture of, 246. 



Chlorostoma, formation of, 218. 

 350. 



Chrysodomus, characters of, 90. 308. 



Chrysostoma, description of, 353. 



Cidaris, characters of the genus, 215. 

 349. 



Circle connecting Testacea, theory 

 of a, 40. 95. Circle of existing 

 birds, 41. Of extant and of ex- 

 tinct Reptilia, 41. Of the entire 

 class of Testacea, traced, 46. 48. 

 Of the entire Animal Kingdom, 

 49. 



Cirripeda, articulated limbs of the, 

 6. First group of Annulosa, 6. 

 Barnacles, 25. 28. Relationship 

 between Cephalopoda and, 52. 



Clausilia, genus, 161. Characters 

 of, 182. 334. Analogies of, 184. 

 209. 



Clavagella, 363. 



Clavalithes, fossils of the Turbi- 

 nellaj, 77. 94. Characters of, 304. 



Clavatula, of Lamarck, 137. 155. 

 314. 



Clavicantha, 155. 314. C. echinata 

 and auriculifera, fluviatile, 155. 



Cleidothasrus, 374. 



Clithon, 347. 



Clypidella, 356. 



Cochlicopa, 171. 173. 335. 



Cockle, the, 27. What called its 

 foot, 30. 



Coecilia, 44. 



Columbella, J35. 313. C. merca- 

 toria, 150. C. nitida, 151. 



Columbellinae, 61. 134. Conform- 

 ation of the dove-shells, 1S7. 150. 

 The typical, 143. 312. Operculum 

 of, 150. The genera of, 152. Ana- 

 logies of, 153. 



Complanaria gigas, 288, 290. 382. 

 C. rugosa, 288. 



Conchifera, of Lamarck, 22. 



Concholepas, 73. 100. 301. 



Conchology, definition of, 10. The 

 interests of geology require that 

 shells should be scientifically stu- 

 died, 12. Advantage of a genuine 

 classical nomenclature, 13. In- 

 feriority of modern compound 

 names, 13. The Linnaean no- 

 menclature, 14. System of Lin- 

 naeus, 15, 16. Plates by D'Ar- 

 genville and others, 14. Merits 

 of the chief modern writers on, 

 15, 16. et passim. Great difficulty 

 of completing a general and illu- 

 minated work on, 18. Theory of 

 a perfect circular group of all 

 the Testacea, 40. 46. Knowledge 

 of the animals increased, 97. 

 Mr. Cuming's discoveries, 127. 

 Theory of variation, 127- Sys- 

 tematic arrangement of, 127. 295. 

 Glossary, 391. 



Conella, 312. 



Cones, smooth shells of the, 61. 116. 

 311. With coronated tubercles, 

 116. The Coninffi described, 

 137. 310. Their genera, 150. 311. 

 Their connection with the Strom- 

 binae, 146. Analogies and cha- 

 racters of the sub-genera of, 148. 

 150. 



Conidea, characters of, 151. 153. 313. 



Conilithes antedituvianus, 311. 



Conrehelix, remarks on, 127. 129. 

 321. 



Cortcelix, characters of, 321. 



Conorbis dormiter, 312. 



Con us amadis, 143. C. bandanus, 

 147. C. arenatus, 147. Types of 

 the sub-genera, 148. 311. C. dor- 

 miter, fossil, 149. 



Coralliophaga,259. 376. 



Corals, growth of, 65. 



Corbis, Lam., 371 . 



Corbula, 367. 



Coriocella, 235. 355. 



Coronaxis, 147. 311. Types of the 

 sub-genera of, 148. 



Costellaria, form of, 320. 



Cowries, 61. 63. 324. Analogy of 

 Cypraecassis to, ^67. The Cyprae- 

 inae, typical, 135. 324. 



Crabs, with bivalve shells, 52. 



Crassatella, 369. 



Crassina, Lam. t 372. 



Crassispira, characters of, 152. 313. 



Creator, works of the, perfect, 42. 



