INDEX. 



547 



Pterostoma, new species of, 91. 

 Pterygospidea, new species of, 321. 

 Ptilopus, new species of, 538. 

 Pyrrliopyga, new species of, 128. 

 Raja, new species of, 434. 

 Ratitse, on the nomenclature of the 



gi'oups of, 499. 

 Redoa, new species of, 92. 

 Rhizodopsis and Rhizodus, on the 



structure of the lower j aw 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 teruiiuation of 



the nerves in the electrical appa- 

 ratus of the torpedo, 448. 

 Royal society, proceedings of the, 



146, 361. 

 Salenia, new species of, 256. 

 Salenidse, 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 new 



genus, 528. 

 Scolymia, new species of, 304. 

 Scorpajna, 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 the Echinoder- 



mata of the Arctic expedition, 



449. 

 Smith, E. A., on Arctic Mollusca, 



131 ; on a new species of Helix, 



242 ; on a new species of Bulimus, 



538. 

 Sollas, J., on the changes produced 



in the siliceous skeletons of cer- 

 tain sponges by caustic potash, 



286. 



Soronia, description of the new genus, 



83. 

 Speiredonia, new species of, 358. 

 Sphaerotherium, new species of, 116. 

 Sphenaidax, characters of the new 



genus, 503. 

 Sphenophorus striatus, on the de- 

 structive habits 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 Ayrshire, 



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 liziirds, 160. 

 Styphloderma, description of the new 



genus, 424. 

 Synaphobranchus, new species of, 



AAo. 

 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, 28.3. 

 Tegenaria, new species of, 275. 

 Tej ovaranus, description of the genus, 



160. 

 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. 



