INDEX. 



447 



Parmelia, new species of, 381. 



Patiria, new species of, 203. 



Pecopteris, new species of, 152. * 



Pecten, descriptions of fossil species of, 

 298. 



Pennatula, new species of, 347. 



Pentaceros, on some species of, 196. 



Pentagonaster, new species of, 200. 



Perigonimus, characters of the new ge- 

 nus, 347. 



Petasidae, new species of, 409. 



Petricia, new species of, 202. 



Pfeiffer's, Dr., Heliceorum viventium Mo- 

 nographia, reviewed, 345. 



Phragmicoma, new species of, 380. 



Phyllotheca, observations on the genus, 

 152 ; new species of, 156. 



Pieris, new species of, 63. 



Pilotrichum, new species of, 378. 



Plagiochila, new species of, 381. 



Plants, on some, collected in the line of 

 the Rideau Canal, Canada West, 11 ; on 

 some, gathered during a short visit to 

 Iceland in 1846, 30 ; on the power of 

 living, to restrain the evaporation of 

 the cell-sap, 35 ; description of new 

 fossil, 145. 



Plesiosaurus, on the atlas, axis, and sub- 

 vertebral wedge-bones in the, 217. 



Pleurorhynchus, new species of, 300. 



Pleurotomaria, new species of, 306. 



Polycystina of Barbados, on the microsco- 

 pical siliceous, 115. 



Polygastrica, characters of new genera 

 of, 127. 



Porcula, new species of, 434. 



Porcupines, descriptions of new species 

 of, 349. 



Procellaria, on a new species of, from 

 Florida, 211. 



Productus, new species of, 236. 



Pteraster, new species of, 204. 



Pteropoda, descriptions of new fossil, 306. 



Pullastra, new species of, 305. 



Pygorhynchus, new species of, 142. 



Pyranga, new species of, 143. 



Itadula, new species of, 380. 



Randasia, on some species of, 195. 



Reid, Dr., on the development of the 

 Medusa, 129. 



Rhinanthaceae, on the parasitical nature 

 of the, 209. 



Rissoa, new species of, 16. 



Royal Society, proceedings of the, 273. 



Sars' Fauna littoralis Norvegiae, reviewed, 

 346. 



Savage, Rev. T. S., on a new orang- 

 outan, 286. 



Schizorhina, new species of, 264. 



Schomburgk, Sir R. H., on the microsco- 

 pical siliceous Polycystina of Barbados, 



and their relation to existing animals, 

 115 ; on some new grasses and sedges 

 from the east coast of Demerara, 396. 



Sedges from the coast of Demerara, de- 

 criptions of, 407. 



Seeds, on the relative duration of the 

 power to germinate in, 38. 



Shells, new, 16, 207. 



Smith, J. T., on the Ventriculidae of the 

 chalk, 73, 176 ; on the different beds of 

 the white chalk, and on the faults and 

 dislocations which they exhibit, 334. 



Smith, F., on a new species of hymeno- 

 pterous insect belonging to the family 

 Sphegidae, 394. 



Sowerby, G. B.,jun., on several new spe- 

 cies of Spondylus, 207. 



Spermatozoa of the Indian elephant, on 

 the, 424. 



Sphegidae, new species of, 394. 



Sphenopteris, new species of, 149. 



Spiders, on the habits of certain, 289 ; 

 new species of, 290. 



Spirifera, new species of, 233. 



Spondylus, on several new species of, 207. 



Stellaster, new species of, 197. 



Stethorectus, new species of, 394. 



Strange, Mr. F., on some rare birds of 

 New Zealand and Australia, 55. 



Strigops habroptilus, description of, 66. 



Strombodes, new species of, 227. 



Sylvia Turdoides, on the capture of, in 

 Britain, 135. 



Tatum, T., on two new species of Carabus 

 from Asia, 14. 



Taxidea, new species of, 434. 



Taylor, Dr. T., on five new species of 

 cryptogamic plants from Jamaica, 379. 



Terebratula, new species of, 253. 



Teredo norvegica, observations on, 157. 



Tetragnatha, new species of, 293. 



Tetrastichus, new species of, 28. 



Thames, on the pliocene deposits of the 

 valley of the, 164. 



Thompson, W., on the Teredo norvegica, 

 Xylophaga dorsalis, Limnoria terebrans, 

 and Chelura terebrans, combined in de- 

 stroying the submerged wood-work at 

 the harbour of Ardrossan on the coast 

 of Ayrshire, 157 ; on the fauna of Ire- 

 land, 169, 237. 



Thwaites, G. H. K., on conjugation in the 

 Diatomaceae, 9, 343. 



Tosia, new species of, 201. 



Treviranus, L. C, on the structure of the 

 fruit of the Cruciferae, 361. 



Tribrachyocrinus, description of the new 

 genus, 228. 



Trilobites, new, 229. 



Triton, on the number of British species 

 and mode of development of, 70. 



