416 



Pyrulinse, genera described, 73. 88. 

 307. Characteristics of the pear- 

 shells, 76. 83. Resemblances to 

 Purpurinffi, 88. j to Fusinae, 92.. 



Quadrupeds, analogical " compari- 

 sons of Gasteropoda|with, 49. 



Quoy, M., newishells discovered by, 

 17. 196. His researches in testa- 

 ceous animals, 17. 156. 204. Leio- 

 domus of, 69. His plates valuable, 



, 128. 



R. 



Radiata, the second class of Mol. 

 lusca, 5. Nerves of, radiated, 5. 

 Destitute of eyes, 8. Analogies 

 of, 52. 



Ranella, 64. 297. 



Rapella, 82. 307. 



Reniella, 386. 



Reproduction, modes of testaceous, 

 29.54. 



Reptilia, analogy of Nudibranchia 

 with, 50. 



Respiration of Testacea, &c., 29. 55. 

 Siphonic organ of, 55, 111; 



Rhinoclavis, 157- 315. 



Rhinodomus, 80. 305. 



Rhodostoma, 208. 346. 



Ricinula, 72. Planospira, 73. Cha- 

 racters of, 300. 



Rimula, 243. 356. Z 



Rissoa, 343. 



Rostellaria, 138. 310. Elegance of 

 their form, 140. R. rectirostris, of 

 great rarity, 141. 146. R. curvi- 

 rostris, 141. R. fissurella, 141. 

 R. columbata, 141. R. macro- 



' ptera, 144. R. cancellatus, 146. 

 R. canalis, 146. Analogies of the 

 group, 145. Species of, 145. 



Rotella, 213. 222. 227. 353. 



RotellinEe, 213. 222. 353. 



Rotifera, are prototypes of the Ra- 

 diata, 4. n. 



Sanguinolaria, 366. 



Saxicava, 376. 



Saxicavidae, 257. 259. 375. 



Scabricola, 319. 



Scaiaria pretiosa, 82. 185. 343. Cir- 

 cular mouth of, 207. 



Scaphella, genus, 100. Types of, 

 123. 318. Connection with Volu- 

 tilithes, 124. Forms a circular 



group, 125. S. maculata, 101. S. 

 fulgetrum,< 101. S. fusiformis, 

 103. 108. 123. S. papillaris, 103. 

 108. S, undulata, 107. 123. S. pa- 

 pulosa, 108. 123.: 

 Scaphula, 132. 322. 

 Scarabus, 196. 208, 209. 344. 

 Schizodesma, 368. 

 Scissurella, 209. 344. Sowerby's fi- 



gures of, 209. 

 Scolymince, 75. 78. The circle ef, 

 perfect, 81. 95. Classification of 

 the genera, 304. 

 Scolymus, 77. 115. S. umbilicaris, 

 80. Characters and species of, 

 304. 

 Scorpions, observation on, 53. 

 Scutibranchia, of Cuvier, 25. 47. 

 358. Respiration of the, .57. In- 

 ternal structure, 57. 60. 239. 

 Divisions of, 240. Circle of, 245. 

 Sea eggs, or Ecliinida, 5. 

 Senectinffi, or snake-shells, 212. 214. 



318. Analogies of, 224. 

 Senectus, 206. 213. Species of, 215. 



348. 

 Shells and sheW-fish, 2,et seq. Study 

 of, important to geology, 9. 

 Science looks to the animal rather 

 than its shelly domicile, 10. On 

 what principle cabinets should be 

 arranged, 10. Modifications of 

 the forms of, 11. New shells im- 

 ported, 17. Habits of the animals 

 investigated, 17. Desiderata as 

 to plates representing, 19. Divi- 

 sions and analogies of, 26. Struc- 

 ture of, 27. Locomotion of, 30. 

 Permanent habitat of, 32. River, 

 33. Land, 33. 56. Gastropod, 53. 

 Spiral, 62. The Helicids de- 

 scribed, 160. Marine, 195. 206. 

 River bivalves, 259. et passim. 

 Systematic arrangement of, 295. 

 Explanation of terms, 391. 

 Sigaretus, animal of the, 229. 234. 

 241. 345. Sigaret of Tonga, 235. 

 Siliquaria, 362. 

 Siphonaria, 58. 245. 357. 

 Siphonostoma, 333. 

 Skin, of Testacea, resembles a man- 

 tle, 29. 

 Slugs, terrestrial and fluviatile, 25. 

 SO. Description of, 35. 45. 55. 

 Mantle of, 56. Respiration of, 56. 

 Structure of, 162. Oceanic, 238. 

 Classification of, 327. 

 Snails, account of, 25. 55. 164. Uni- 

 valve, 27- Head and eyes of, 33. 

 Food of, 33. Minute testaceous, 

 described, 45. Respiratory per- 

 foration in the mantle, 56. Land 

 and freshwater, 59. 158. The 

 pre-eminent type of phytopha- 

 gous Gasteropoda, 160. Families 



