INDEX. 



471 



Palmellese, observations on the, 312. 



Panopeus, new species of, 286. 



Parrot, new species of, 210. 



Pempheris, new species of, 15. 



Penicillium, on a new fossil species 

 of, 381. 



Pentacrinus, new species of, 406. 



Perlidae, new species of, 357- 



Petalodus, new species of, 125. 



Petrodus, characters of the new ge- 

 nus, 132. 



Pfeiffer, Dr. L., on some new species 

 of Helicea, 288. 



Physonemus, new species of, 117- 



Placodermi of the palaeozoic rocks, on 

 the, 277- 



Planorbis, new species of, 453. 



Plants, descriptions of new, 10, 36 ; 

 new British, 149, 292, 293; on 

 gemmationin the lower tribesof,312. 



Platycanthus, new species of, 120. 



Plectropoma, new species of, 13. 



Plocoscyphia, new species of, 397. 



Pcecilodus, new species of, 129. 



Polyporus, new British species of, 264. 



Polyrhizodus, description of the new 

 genus, 125. 



Pomacentrus, new species of, 18. 



Primula, on the form of the capsule 

 and seeds of the British species of, 

 164. 



Procas, on the British species of, 168. 



Psammodus, new species of, 122. 



Psammosteus, new species of, 7- 



Pteronarcys regalis, on the anatomy 

 and affinities of, 147, 356. 



Ptilocercus, description of the new 

 genus, 213. 



Purpuroidea, description of the new 

 genus, 250. 



Pygaster, new species of, 413. 



Radiata, mesozoic, descriptions of 

 new, 397. 



Ralfs's, J., British Desmidieae, noticed, 

 135. 



Reeve, L., on Fastigiella, a new ge- 

 nus of shells, 66. 



Rissoa, new species of, 351. 



Rotifer, dioecious, some account of a, 

 153. 



Royal Society, proceedings of the, 51 . 



Rubus, on the British species of, 32. 



Salpingia, description of the new ge- 

 nus, 273. 



Sargassum, new species of, 203, 274, 

 421. 



Schizophrys, new species of, 282. 

 Schceniclus, new species of, 452. 

 Schomburgk, Sir R. H., on some new 



species of fishes from Barbados, 11. 

 Scinde, notes on the vegetation of, 



144. 

 Scrophularineae, on the parasitical 



habits of, 294. 

 Sea-serpent, observations respecting 



the, 458. 

 Serranus, new species of, 13. 

 Shells, new, 66, 158, 288, 330, 351, 



359, 366, 396, 453. 

 Siderastrsea, new species of, 401. 

 Smith, Mr. T., on the Ventriculidae, 



48. 

 Smith, Dr. A., on the red corpuscles 



of the blood of the Lepidosiren 



annectens, 292. 

 Smynthurus, new species of, 464. 

 Stark, R. M., on a botanical visit to 



Ben Wyvis, Ross-shire, in June 



1847, 67. 

 Sterna, new species of, 282, 364. 

 Stocks, J. E., on the vegetation of 



Scinde, 144. 

 Strange, F., on Myochama anomi- 



oides, 222. 

 Streptaxis, new species of, 288. 

 Streptothrix, new species of, 382. 

 Strickland and Melville's Dodo and 



its kindred, reviewed, 443. 

 Strix Stridula, on the habits of, 220. 

 Stylopora, new species of, 399. 

 Taylor, R., on the origin of the name 



Vanessa, 68. 

 Tetrodon, new species of, 20. 

 Thalurania, new species of, 65. 

 Thomas, Dr. K., on the amber beds 



of East Prussia, 369. 

 Thwaites, G. H. K., on an apparently 



undescribed state of the Palmelleae, 



with observations on gemmation in 



the lower tribe of plants, 312. 

 Totanus, new species of, 452. 

 Tremella, new species of, 266. 

 Tripterus, description of the new ge- 

 nus, 306. 

 Trochilidae, on some new genera and 



species of, 62. 

 Trochilus, new species of, 65. 

 Troschel, Dr., on some new fish from 



Barbados, 12. 

 Urosthenes, characters of the new 



genus, 149. 

 Van Beneden, P. J., on the organiza- 



