INDEX. 



471 



Philentoma, characters of the new genus, 

 229. 



Phlebenterata, remarks on tlie order, 

 145. 



Pholioilotus, new species of, 209. 



Physorhinus, new species of, 25. 



Phytelephas macrocarpa, notice respect- 

 ing the, 130. 



Picus, new species of, 48, 229. 



Piscicola, new British species of, 441. 



Planaria, descriptions of new British spe- 

 cies of, 437. 



Plants, on the endemic distribution of, 

 126; rare British, notices respecting 

 the habitats of, 141 ; from the shores 

 of Davis's Straits, observations on, 166. 



Platesthes, characters of the new genus, 

 317. 



Pnoepyga, new species of, 195. 



Podabrus, new species of, 427. 



Pollicita, characters of the new genus, 4. 



Polynoe cirrata, on the development of,' 

 183. 



Polypes, anatomical and physiological 

 observations on some, 385. 



Potatoes, on the disease of, 358. 



Pycnonotus, new species of, 228. 



Pyctoris, characters of the genus, 194. 



Pyrrhulinota, new species of, 206. 



Ralfs, J., on the British Desmidieae, 10 ; 

 on the British Diatomaceae, 109 ; on 

 the genera Spirulina and Coleochaete, 

 308. 



Rallus, new species of, 230. 



Rana aquensis, description of, 352. 



Ranunculus Lenormandi, notice respect- 

 ing, 141. 



Reade, Rev. J, B., on the cilia andcihary 

 currents of the oyster, 124. 



Reeve, L., on some new species of Mitra, 

 257 ; on the dissolution and re-calcifi- 

 cation of the shell in Cypraea, a genus 

 of pectinibranchiate mollusca, 374. 



Reid, Prof. J., anatomical and physiolo- 

 gical observations on some zoophytes, 

 385. 



Richardson, Dr., on the ichthyology of 

 China, 123. 



Royal Society, proceedings of the, 131. 



Rubus, description of a new species of, 

 114 ; remarks on some forms of, 361. 



Saccopteryx, observations on the genus, 

 27\i. 



Sagitta bipunctata, anatomical and phy- 

 siological observations on, 289. 



Salmon, on the migrations of, 141. 



Salter, T. B., on some forms of Rubus, 



361. 

 Salwey, Rev. T., list of the lichens found 

 in the neighbourhood of Oswestry and 

 Ludlow, 90. 



Saperda, new species of, 209.?*^ Jf^ftiq? 



Sars, M., on the occurrence of an intesti- 

 nal worm in an acaleph, 88 ; on the 

 development of the Annelides, 183. 



Saxifraga Geum, notice respecting a mon- 

 strosity occurring in, 125. 



Saxifrages, Irish, notice respecting the, 

 131. 



Sceliages, new species of, 275. 



Schizopetaleae, observations on the group^? 



m. 



Schomburgk, Sir R., on the Murichi or 

 Ita palm of Guiana, 125. 



Schrenk, Dr., explorations of, 355. 



Sohulz, Dr. F., on the microscopic con- 

 stituents of the ash of fossil coal, 69. 



Scolex Acalepharum, observations on, 88. 



Scotobius, new species of, 319. 



Scymnus, new species of, 41. 



Sebasteos, on a new species of, 275. 



Sedgwick, Prof., on the fossiUferous slates 

 of North Wales, 135. 



Selenophorus, new species of, 22. 



Seller, Dr. W., on some plants obtained 

 from the shores of Davis's Straits, 166. 



Shadbolt, G., on a British species of 

 Ixodes found upon cattle, 64. 



Shells, new, 56, 58, 61, 128, 253, 332, 

 336, 341, 356. 



Spain, observations on the flora of, 113, 

 189, 248. 



Sphaerozosma, on the British species of, 

 13. 



Sphenoeacus, new species of, 63. 



Spinther, characters of the genus, 8. 



Spirulina, on the British species of, 308. 



Spongiadae, descriptions of some new 

 genera of, 400. 



Spratt, Lieut., on the geology of Lycia, 

 136. 



Stachyris, characters of the genus, 193. 



Stark, Dr. J., on Tetrao medius, 57. 



Stematumenia, characters of the new 

 genus, 406. 



Sterna, new species of, 346. 



Sterope, new species of, 325. 



Stomion, description of the new genus, 

 27. 



Taphozous, new species of, 55. 



Tarsiger, characters of the genus, 198. 



Temnoris, new species of, 202. 



Tetrao medius, notice respecting, 57. 



Tetrastoma, observations on, 88. 



Thaumantis, new species of, 234. 



Theron, new species of, 230. 



Thinobatis, new species of, 320. 



Thompson, W., on Larus capistratus, 357; 

 on the occurrence of the belted king- 

 fisher, Alcedo Alcyon, Linn., in he- 

 land, 430; on fossil infusoria of the 

 countv of Down, 213. 



