506 



On Lininoeodiuni victoria, a new Hy- 

 clroid Medusa of fresh water, by 

 Prof. G. J. Alhnan, 131. 



On the Eetention of Sur-anal plate in 

 an Echinometra, by F. Jeffrey Bell, 

 318. 



On the Classification of Gasteropoda, 

 by Dr. J. D. Macdonald, Part I., 161 ; 

 Part II., 241. 



On the extinct Land-Tortoises of Mau- 

 ritius and Rodriguez, by Alf. C. 

 Haddon, 58. 



On the genus Plocamia, Schmidt, and 

 other Sponges of the order Echino- 

 nemata, by S. O. Ridley — with De- 

 script, of two new sp. of Dirrhopalum 

 by Prof. P. M. Duncan, 476. 



On the genus Solanocrinus, Goldfuss, 

 and its relations to recent Coraatulse, 

 by P. Herbert Carpenter, 187. 



On the Green Colour of the Hair of 

 Sloths, by H. C. Sorby, 337. 



On the Hebridal Argentine, by F. 

 Day, 78. 



On the Land-Molluscan genus Durgella ; 

 with notes on its anatomy, and de- 

 scrip. of a new sp., by Lieut.-Col. 

 H. H. Godwin- Austen, 291. 



On the Nostrils of the Cormorant (Pha- 

 lacrocorax carbo), by Prof. J. C. 

 Ewart, 455. 



On the occurrence of the Norwegian 

 Argentina silus on the shore of the 

 Moray Firth, by Thos. Edward, 

 334. 



On the specific identity of Scomber 

 punctatus, Couch, with S. scomber 

 Linn., by F. Day, 146. 



On the supposed Stridulating- Organs of 

 Steatoda guttata and Linvphia tene- 

 bricola, by F. M. Campbell, 152. 



On the Tusks of the fossil Walrus found 

 in the Red Crag of Suffolk, by E. 

 Ray Lankester, 144. 



On two cases of incorporation by 

 Sponges of spicules foreign to them, 

 by S. O. Ridley, 149. 



Onchopora Sinclairei, Polyzoa paras, 

 on, 355. 



Onesimus Edwardsh, 66. 



Oniscia cancellata, 268 ; citharia, 266 ; 

 Denisoni, 268 ; grandis, 268. 



Ophiocephalus, 34, 35; aurantiacus, 

 35 ; striatus, 34. 



Ophiocrinus Hyselyi, 199. 



Ophiolepis, 77. 



Ophionyx, 73 ; armata, 77 ; scutellum, 

 77. 



Ophiopholis, 77. 



Ophioscolex, 143. 



Ophiothrix, 73, 77, 412. 



Ophiurid, n. sp., descrip. of, 74. 



Orcynus brachypterus, 311 ; thvnnus, 

 311. 



Oribates, 387. 



Osmerus hebridicus, 82. 



Osphromenus, 35; olfax, 33. 



Ostracion quadricornis, 316. 



Otocysts and Otolites of Medusae, All- 

 man's remarks on, (ftnote) 137. 



Pachygrapsus socius, 86 ; transversus, 

 86. 



Packard's views, segm. of insects, 16, 

 17, 18. 



Pammelas perciformis, 310, 317. 



Pandalus borealis, 63. 



Panopeus, 86. 



Parasites of Elephants, Dr. T. Spencer 

 Cobbold, on, 333. 



Pedicelhna, 1, 2. 



Pelamys sarda, 311. 



Pentacrinus, 190 ; asteria, 210, 211, 

 215; briareus, 210, 215; caput- 

 medusse, (ftnote) 188 ; cingulatus. 

 211; decorus, 211; Fisheri, 211,' 

 215 ; Jaegeri, 211 ; Maclearanus, 

 210; pentagonalis ferratus, 210; 

 pentagonalis personatus, 211 ; Sig- 

 maringensis, 210, 211, 215 ; Wyville- 

 Thomsoni, 210, 215. 



Periophthalmus Schlosseri, 51, 



PetasidEe, (ftnote) 132. 



Petromyzon fiuviatihs, 40. 



Phalacrocorax carbo, nostrils of, 455. 



Phascolosoma, sp. with paras. Polyzoa, 



Pheidole megacephala, exp. on, 170. 



Pholadomya, 146. 



Phyllopoda (Greenland), 70. 



Pilot-fish, 56. 



Pinnotheres, 86 ; angelicus, 86 ; Ged- 

 desi, 86 ; Guerinii, 87 ; hirtimanus, 

 87 ; lithodomi, 87 ; maculatus, 87 ; 

 margarita, 87 ; ostreum, 87. 



Pipe-fish, 41. 



Pleurococcus Bradypi, 340; Choloepi, 

 340. 



Pleuronectes flesus, 316. 



Pleuronectidse, habits of, 53 ; variations 

 in, 315. 



Pleurotoma, 218 ; acanthodes, 413, 

 433, 435, 437; amoena, 426; am- 

 phiconus, 409 ; anteridion, 399 ; ara- 

 neosa, 462 ; atracto'ides, 407 ; aula- 

 coessa, 472 ; aureola, 450 ; Barklien- 

 sis, 429 ; biconspicua, 447 ; bico- 

 nus, 409 ; bolbodes, 402, 423, 424 

 brachytona, 413, 415 ; brychia, 451 

 bulbacea, 413, 418 ; carinata, 442 



