I N D E X. 



503 



Plesiothoruipos Biimevi, observations 



on, 440. 

 Pleurotomaria, new species of, 417- 

 Plicatula, new s])ecies of, 420. 

 Polvides rotundus, observations oii, 



87. 

 Polypes, observations on, 66. 

 Priestley, W. O., on some British spe- 

 cies of Carex, 188. 

 Protovirgularia, characters of the new 



genus, 272. 

 Pteropus, new species of, 133. 

 Ptilociictya, new species of, 286. 

 Ptiloris, new species of, 139. 

 Pivchomya, observations on the genus, 



408. 

 Pyramidellidse, observations on the, 



444. 

 Pyritonema, new species of, 273. 

 Quatrefages, A. de, on the visual 



organ of the Annelida, 227. 

 Radiata, on some new genera and 



species of Silurian, 270, 474. 

 Reeve, L., on new species of Bulimus, 



61 ; on a new species of Cytherea, 



291. 

 Regalecus glesne, note on the occur- 

 rence of, 496. 

 Reptiles, on a new genus and six new 



species of Saurian, 344. 

 Respiration, on the organs of, in the 



Arachnida, 67. 

 Retepora, new species of, 477- 

 Rhyncolophus, new species of, 187- 

 Rimula, new species of, 416. 

 Rissoa, on some species of, 33. 

 Rissoina, new species of, 419. 

 Rostellaria, new species of, 419. 

 Rotifera, descriptions of new, 18. 

 Royal Society, proceedings of the, 125. 

 Rubi, characters of new British, 490. 

 Ruticilla, new species of, 140. 

 Salter, Dr. J., on Lerneonema Bairdii, 



85. 

 Salticus, new British species of, 336. 

 Saurian reptiles, on a new genus and 



six new species of, 344. 

 Saw-fly, on the ceconomy of a new 



species of, 393. 

 Scalaria, new species of, 419. 

 Schizosi])hon, on a new British Alga 



belonging to the genus, 266. 

 Schoenobates, characters of the new 



genus, 343. 

 Scopolia, observations on, 35. 

 Sea, on the luminosity of the, 425. 



Seal, variation in the teeth of the 

 crested, 5S. 



Selaudria, new species of, 393. 



Serpents of St. Lucia, on the, 130. 



Serpula, new sj^ecies of, 420. 



Shells, new :-61, 148,212. 230, 251, 

 291, 300, 386; fossil, on some, from 

 the middle division of the inferior 

 oolite in Gloucestershire, 401. 



Sirex gigas, occurrence of, at Bath, 

 60. 



Sitta, new species of, 141. 



Snails, long-suspended vitality of, 68, 

 489. 



Solarium, new species of, 419. 



Sowerby, G. B., jun., on a new genus 

 of Pholadidae, and on a remarkable 

 specimen of Pholas calva, 299. 



Sowerby, J. D. C, on some mon- 

 strous flowers of Pelargoniums, 

 144 ; on the names of the Victoria 

 water-lily, 310. 



Sphaerodactylus, new species of, 347. 



Spha^ronema deformans, remarks on, 

 309. 



Sphecotheres, new species of, 140. 



Spongarium, new species of, 281. 



Strephodes, new species of, 275, 378, 

 474. 



Streptaxis, new species of, 291. 



Strickland, H. E., on the dodo and its 

 kindred, 290. 



Stromatopora, new species of, 377. 



Strombodes, new species of, 274. 



Stylifer, observations on the genus, 

 463. 



Succinea, on the habits of a Cape, 251 ; 

 new species of, 297- 



Syme, J. T., on the occurrence of 

 Eleocharis uniglumis, 145. 



Syngnathi, notes on the, 396. 



Tancredia, characters of the new ge- 

 nus, 407, 424. 



Taxocrinus, new species of, 289. 



Teredo megotara, on the anatomy of, 

 328. 



Tetrodon Pennantii, capture of, 311. 



Thomisus, new British species of, 337. 



Thracia, new species of, 230. 



Toads, way in which the skins are 

 shed b}', 69. 



Tornatellida?, observations on the, 444. 



Tornatellina, new species of, 251, 386. 



Townsend, F., on Glyceria pedicellata, 

 70. 



Trees, effects of lightning on, 142. 



