INDEX. 



54; 



Pterostoma, new species of, 91. 

 Pteiygospidea, new species of, 321. 

 Ptilopus, new species of, 538. 

 Pyrrhopyga, new species of, 128. 

 Raja, new species of, 434. 

 Ratitfe, on the nomenclature of the 



gi-oups of, 499. 

 Redoa, new species of, 92. 

 Rhizodopsis and Rhizodus, on the 

 structure of the lower jaw in, 129, 

 244. 

 Rhizopoterion, characters of the new 



genus, 507. 

 Rhodia, new species of, 480. 

 Rhombopora, observations on the 



genus, 36. 

 Rhynchopora, characters of the new 



genus, 528. 

 Rhyparioides, characters of the new 



genus, 395. 

 Rotalia, new species of, 470. 

 Rouget, 0., on the termination of 

 the nerves in the electrical appa- 

 ratus of the torpedo, 448. 

 Royal society, proceedings of the, 



146, 361. 

 Salenia, new species of, 256. 

 Salenidfe, on the, 70, 245. 

 Salmo, new species of, 444, 

 Schizoporella, characters of the new 



genus, 527. 

 Schizorhabdus, characters of the new 



genus, 507. 

 Schizotheca, characters of the now 



genus, 528. 

 Scolymia, new species of, 304. 

 Scorpisna, new species of, 435. 

 Sebastes, new species of, 434. 

 Semisuberites, new species of, 39. 

 Setina, new species of, 87. 

 Setinochroa, new species of, 87. 

 Setora, new species of, 93. 

 Setosella, characters of the . new 



genus, 529. 

 Seudyra, new species of, 85. 

 Sirembo, new species of, 437. 

 Sladen, "W. P., on tlie Echinoder- 

 niata of the Arctic expedition, 

 449. 

 Smith, E. A., on Arctic Mollusca, 

 131; on a new species of Helix, 

 242 ; on a new species of liulimus, 

 5:58. 

 Sollas, J., on the changes produced 

 in tlie siliceous skeletons of cer- 

 tain sponges by caustic potaah, 

 285. 



Soronia, description of the new genus, 



83. 

 Speiredonia, new species of, 358. 

 Sphferotherium, new species of, 116. 

 Sphenaulax, characters of the new 



genus, 503. 

 Sphenophorus striatus, on the de- 

 structive liabits of, 334. 

 Spiders, on new or little-known, from 



the Arctic regions, 273. 

 Spilarctia, new species of, 394. 

 Spilosoma, new species of, 88. 

 Sponges, on arctic and antarctic, 38 ; 



on a fossil species of sarcohexac- 



tinellid, 176 ; studies on fossil, 



257, 405, 446, 501 ; on the changes 



produced in the siliceous skeletons 



of certain, by caustic potash, 285 ; 



on carboniferous, from Ayi'shire, 



425. . 

 Sporadopyle, characters of the new 



genus, 503. 

 Squamulina scopula, observations on. 



337. 

 Staphida, new species of, 519. 

 Starfishes, on the development of, 



154, 158. 

 Stauractinella, characters of the new 



genus, 515. 

 Stauroderma, characters of the new 



genus, 509. 

 Stauropus, new species of, 90. 

 Steindachner, Dr., on two new genera 



and species of lizards, 1(30. 

 Styphlodenna, descrijition of the new 



genus, 424. 

 Synaphobranchus, new species of, 



445. 

 Syneta, new species of, 378. 

 Tagiades, new species of, 343. 

 Tagora, new species of, .347. 

 Tanygnathus, new species of, 533. 

 Tappesia, characters of the new 



genus, 378. 

 Tarentula, new species of, 283. 

 Tegenaria, new species of, 275. 

 Tejovaranus, description of the genus, 



KJO. 

 Teracolus, new .species of, 49. 

 Terias, new species of, 48, 355. 

 Tetradium, observations on the genus, 



161. 

 Thamniscus .pustulatus, note on, 



36. 

 Thanatarctia, characters of the new 



genus, 395. 

 Thosea, new species of, 348. 



