410 



Crenatula, 385. 



Crepidula, 230, 231. Natural sta- 

 tion of, 239. 355. 



Cryptoconchus, zone of, 247. 358. 



Cryptostoma, 235. 



Cuma sulcata, 87. 307. 



Cumingia, 370. 



Cunicula planeata, cuneata, and 

 purpurata, 268. 378. 



Cuttlefish, description of the, 5. 

 Eyes of the, 8. Mode of swim, 

 ming, 31. Food of, 34. Organi- 

 sation of, 38. Extinct tribe of, 

 fossil, 48. 



Cuvier, baron, character of his 

 Hegne Animal with regard to the 



, Mollusca, 16. His Memoires on 

 the Testacea, 20. System of, 25. 

 25. 54. 211. Definitions in Grif- 

 fith's, 5o. 



Cyclas, 257. 369. 



Cyclinae, sub-family, 369. 



Cyclobranchia, comprehend Patella 

 and Chiton, 25. 55. United by 

 Cuvier to Dithyra, 54. Con- 

 struction of, 58. 246. 357. 



Cyclocantha, with a circle of spines, 

 215. 348. 



Cyclocotyles, external parasites, 46. 



Cyclonassa, genus, 69. 300. 



Cyclophora, 186. 336. 



Cyclops, a genus of crabs, 52. 



Cyclostoma, 5(i. 171. 198. So6. Its 

 analogy to Pupa, 169. Mouth, 

 characters of, 185. 2U7. Discoid 

 form of, 227. 



Cyclotus, of Guilding, 186. 336. 



Cylindreila, description of, 135. 326. 



Cyllene, the genus characterised, 

 81. 305. Approximates to Pseud- 

 oliva, 82. 



Cymbiola, muricated, 101. 105. 317. 

 «ub-typical, 126. Types of this 

 genus represent those of Voluta, 

 117. Table of analogies, 118. C. 

 vespertilio, 106. 318. C tubercu- 

 lata, 118. C. Braziliensis, 118. 



Cymbium, 104. 117. 



Cyprasa, of Linnaus, 61. 100. 324. 



Cyprsecassis, Q5. Analogy to cow- 

 ries, 67. ; and to the Nassinas, 70. 

 Characters of, 298. 



Cyprasid^, affinities of, 59. 61. Shell 

 described, 63. Analogies to be 

 traced from the animals only, 

 115. n. 135. Family of, 524. 



Cyprasinee, typical forms, 135. 324. 



Cyprslla, structure of, 325. 



Cypreeova, 325. 



Cypricardia, 257. 



Cyrena, 370. 



Cytherea, 372. 



D. 



Decadopecten, 388. 



Delphinula, 215. 348. 



Diagram of the affinities of Muri- 

 cida3 and Turbinellidse, 95. 



Dianchora, 388. 



Diceras, 375. 



Dipsas, of Leach, 263. 288. 



Discodoma, its circumference cari- 

 nated, 192. 329. 



Dithyra, the Aristotelian term for 

 bivalves, 13. Considered ana- 

 tomically, 29. No apparent head 

 or eyes in, 33. All bivalves are 

 marine or fluviatile, 33. Food of, 

 33. Sub-typical, 35, 36. Circle 

 of, 45. Analogies of, 49. 256. 

 Survey of the order, 254. Gene- 

 ralisation, 290. Arrangement of 

 the order, 361. 



Dolabella, 251. 359, 



Dolium, 66. 299. 



Donax, 259. 373. 



Doridium, 252. 360. 



Doris, 24, 25. 37. 250. Has naked 

 branchia, 54, 



Dove shells, 137. 



E. 



Ear-shells, see Haliotis. 



Earth-worms, their body disposed 

 in rings, 7. Resemblances of, to 

 the eel, 7. 



Eburna, types of, 81, 82. structure, 

 306. 



Eburninae, base truncated and 

 notched, 76. Sub-family of, 81. 

 Genera and analogies of, 83. Af- 

 finities of, 95, 96. Definition of, 

 305. 



Echinella, sub-genus of Trochus, 

 207.221.352. 



EchinidcB, shells of the, 7. Ten- 

 tacula ;of, 7. Slow locomotion 

 of, 7. 



Echinorynchus, 46. 



Echinus, the, its conformation, 7. 



Elenchus, 219, 220. 351. ' 



Emarginula, 58. 240. Characters 

 of, 243, 244. 356. 



Enomphalus, fossil, 196. 



Ensatella, 365. 



Epistyla conica, 165. 331. 



Erato, 135. 326. Unites the Cypras- 

 idcB and Volutidee, 326. n. 



Eruca, Sw., 334. 



Erycina, 259. The name pre-occu- 

 pied, 370. 



Eryx, instead of Erycina, 3713. 



Etheria, 257. 390. 



Etheridae, family of, 390. Remark- 

 able affinities of this group, 257. ^ 



