INDEX. 



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

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

 tion of genera. 



AcARDO, 373. 



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

 valve Testacea, 25. 



Achatinse, snails with elongated 

 spiral shells, 1G2. 174. 179. 334. 

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

 marginata, 170. Sub-genera and 

 analogies, 173. 175. 179. 5oQ. 

 Point of union with the Bulimi- 

 r\dz. 183. 



Achatinellffi, 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-definedby 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. 



iEglia, genus, 265. 378. Represents 

 Hyria, 275. 



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

 291. Of Testacea, form a conti- 

 nuous circle, 41. et passitn. 



Akera, 249. 



Alee, 183. 



Alasmodon, 263, 264. 273. 381. 

 A. undulatus and calceolus, 263. 

 288, 289. A . rugosus, 273. 



Alasmodontinffi, 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. 



Ampullarinse, or apple-snails, 1P5. 

 339. Guilding's drawing of, Jbi7. 



Analogies, in Malacology, different 

 from athnities, 42. 183. 291. Con- 

 sist of mutual representations, 49. 

 Of Annelides with Nudibranchia, 

 51. Of Parenchymata with annu- 

 lose Vermes, 52. Ofzoophagous 

 and phytophagous Gaste.opoda, 

 111. See various classes and ge- 

 nera. 



Analogy, averification 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-.^amily, Itil. 133. 

 322. 



Anculosa, fluviatile, 199. 210. 340. 



Ancylus, freshwater limpets, 188. 

 338. 



Annnal kingdom, links of compa- 

 rison and resemblance betwixt 

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



AnimalculcK, classification of, 45. 



Aimelides, ring-jointed, and hav- 

 ing red blood, 7. Resemblances 

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

 27. 51. Analogy with Nudibran- 

 chia, 51. 



Annulcsa, the, or insect tribes, 2. 4. 

 Circle or group of, 38. 51. Ana- 

 logies of, 52. 



Anodon, genus, 263. 287. Small 

 depressed summit of, 273. A. ana- 

 tinus, 286. Various other spe- 

 cies of, 286, 287. 



Anodontinffi, the, 259. 286. 381. 

 Analogies of, 287. 



Anomia, 47- 389. 



Aphorrais, 138. 141. 157. 309. Its 



D D 4< 



