INDEX. 



** The page references are to the Author's remarks : to avoid a multiplicity 

 of figures, the reader is referred to the occasional tables for the classifica- 

 tion of genera. 



A. 



ACARDO. 373. 



Acephala, the naked, 5. n. The bi- 

 valve Testacea, 25. 



Achatinae, snails with elongated 

 spiral shells, 162. 174. 179. 334. 

 Sub-typical, 170. 335, 336. A. 

 marginata, 170. Sub-genera and 

 analogies, 173. 175. 179. 336. 

 Point of union with the Bulimi- 

 nse, 183. 



AchatinellEe, 172. 338. 



Acrita, their nervous system gra- 

 nular, 4. n. Probably consists of 

 polypes, corals, and plant-like 

 animals, 5. The group seems to 

 to be ill-defined by naturalists, 43. 



Adanson, on the shell-fish of Sene- 

 gal, 14. 



Adhesion, power of, often by in- 

 numerable suckers, 30, 31. Of 

 the Patella to rocks, 244. 



-Slglia, genus, 265. 378. Represents 

 Hyria, 275. 



Affinity, theory of, 5. 7. 94. 189. 

 291. Of Testacea, form a conti- 

 nuous circle, 41. et passim. 



Akera, 249. 



Ala?, 183. 



Alasmodon, 263, 264. 273. 381. 

 A. undulatus and calceolus, 263. 

 288, 289. A. rugosus, 273. 



Alasmodontinae, the, 276. 287. 381. 

 Connection with Anodons, 288. 

 Analogies of the genera, 290. 



Amphibia, allusions to, 50. 



Amphidesma, 371. 



Amphiuma, worm-like salaman- 

 ders, 43. 



Ampullaria, genus, 55. 339. Siphon 

 of, 160. 



D D 



Ampullarinae, or apple-snails, 195. 

 339. Guilding's drawing of, 197. 



Analogies, in Malacology, different 

 from affinities, 42. 189. 291. Con- 

 sist of mutual representations, 49. 

 Of Annelides with Nudibranchia, 

 51. Of Parenchyrnata with annu- 

 lose Vermes, 52. Of zoophagous 

 and phytophagous Gasteropoda, 

 111. See various classes and ge- 

 nera. 



Analogy, a verification subordinate 

 to that by affinity, 94. 



Anastoma, sub- genus, 192. 329. 



Ancillaria, aberrant group, 97, 98. 

 132. 323. Resemblance to Con- 

 cholepas and Monoceros, 100. 



Ancillarinae, sub-family, 101. 133. 

 322. 



Anculosa, fluviatile, 199. 210. 340. 



Ancylus, freshwater limpets, 188. 

 338. 



Animal kingdom, links of compa- 

 rison and resemblance betwixt 

 various classes of the, 5. 7. 40. 42. 



Animalcule, classification of, 45. 



Annelides, ring-jointed, and hav- 

 ing red blood, 7. Resemblances 

 of, to fishes, 7. ; and to Testacea, 

 27. 51. Analogy with Nudibran- 

 chia, 51. 



Annulosa, the, or insect tribes, 5. 4. 

 Circle or group of, 38. 51. Ana- 

 logies of, 2. 



Anodon, genus, 263. 287. Small 

 depressed summit of, 273. A. ana- 

 tinus, 286. Various other spe- 

 cies of, 286, 287. 



Anodontinse, the, 259. 286. 381. 

 Analogies of, 287. 



Anomia, 47- 389. 



Aphorrais, 138. 141. 157. 309. It 



4 



