INDEX. 
Packard, A. S., jun., on an abbrevi- 
ated metamorphosis in Alpheus 
heterochelis, 447, 
Pagurus, new species of, 275. 
Paludina, on the discrimination of 
the sexes in the genus, 85, 220. 
Pedicellina, on the metamorphosis 
of, 163. 
Pemphigus bursarius, on the migra- 
tions of, 162. 
Penzeidea, on the, 169. 
Penzeus, new species of, 180. 
Petalidium, characters of the new 
genus, 194, 
Phaneropleuron, new species of, 160. 
Philyra, new species of, 263. 
Phrynidia, on Dr. Karsch’s subdivi- 
sion of the, 69. 
Plategyra, new species of, 438. 
Plesiosaurus, new species of, 60. 
Poliakoff, M., on a supposed new 
species of Horse from Central 
Asia, 16. ; 
Polyzoa, contributions towards a 
general history of the marine, 1, 
122. 
Poraniomorpha, characters of the 
new genus, 68. 
Potts, E., on some new genera of 
freshwater Sponges, 387. 
Primitiz, on some Cambrian and 
Silurian, 332. 
Prosopistoma punctifrons, on the 
perfect state of, 73. 
Psammotodendron arborescens, ob- 
servations on, 404. 
Pseudorius, new species of, 452. 
Rheophax, new species of, 405. 
Rhizopods, new, 230; food of young 
Fishes, 240. 
Rhynchopora, new species of, 125. 
Rhynchota, on new, from Japan, 27. 
Ridley, 8. O., on the Madreporaria 
of Ascension Island, 438. 
Rotifera, observations on some, 448. 
Schizoporella, new species of, 12, 
134. 
Schwendener’s, Prof., theory of 
Lichens, observations on, 428. 
Scudder, 8S. H., on the lacustrine 
‘deposits of Florissant, Colorado, 
458. 
Scully, J., on some Mammals from 
Kashmir, 95; on Mammals from 
Kandahar, 222, 
Seals, eared, on the influence of 
463 
marine currents in the geographi- 
cal distribution of the, 70. 
Secusio, new species of, 380. 
Seeley, Prof. H. G., on the Reptile 
fauna of the Gosau formation, 154. 
Sergestes, new species of, 193. 
Shells, new, 88, 441. 
Sicyonia, new species of, 173. 
Siredon lichenoides, observations on, 
235. 
Smith, H. A., on the discrimination 
of the sexes in Paludina, 220; on 
Mollusca of Ascension Island, 430 ; 
on two new species of shells, 441. 
Solaster, new species of, 67. 
Solenocera, new species of, 185. 
Sollas, Prof. W. J., on a new species 
of Plesiosaurus, 60. 
Spatangus purpureus, on the circula- 
tory system of, 451. 
Spathegaster, on alternation of gene- 
ration in, 282. 
Sphallonycha, characters of the new 
genus, 149. 
Sphinges, on some North-American, 
306. 
Spio crenaticornis, on a curious phe- 
nomenon of prefecundation ob- 
served in, 386, ; 
Spiropagurus, new species of, 278. 
Sponges, contributions to our know- 
ledge of the, 101, 241, 450; on the 
development of the fibre in the, 
112; on an organism which pene- 
trates and excavates the siliceous 
spicula of, 120, 222 ; on the affinities 
of Dictyophyton with certain, 167, 
a new species of, 108, 247, 387, 
9. 
Spongilla, on the occurrence of 
Spongiophaga in, 222, 354. 
Spongiophagus Carteri, description 
of, 120. 
Staurastrum, new species of, 230, 
Stock, T., on some British specimens 
of the “Kammplatten” of Prof. 
Fritsch, 90. 
Stomatopora, on some specimens of, 
Templeton, R., on Aulastoma heluo, 
137. 
Tetanola, characters of the new 
genus, 151. 
Thaumastoplax, description of the 
new genus, 261. 
Themistonoe, new species of, 298, 
