445 



Ophhira brevispina, 258. 



Jlolmesii, Lyman, 255. 



teres, Lyman, 198. 



Ophiuridre, corrections in nomenclature 

 of, by Tlieodore Lyman, 202; new 

 species of, by Theodore Lyman, 193, 

 252 ; additions and corrections, 257 ; 

 Say's Synonyms of, 258. 



Optical apparatus, by Dr. Ludwig,229. 



Oregon, Iron mountain in, 191. 



Ornithic bones, impressions of, in sand- 

 stone, 396. 



Ornithological visit to Green Island, off 

 Nova Scotia, 367. 



Ortyx Virgmianus, 120. 



Osteo-dentine, growth of in elephant's 

 tusii, 240. 



Otolicnus apicalis, Du Chaillu, 361. 



Pachyma cocos, 48. 



Pacific Railroad, Natural geological 

 route for, 70. 



Palemon vulgaris, 76. 



Paleozoic rocks of Dennis River, Maine, 

 as compared with those of Nova Sco- 

 tia, Prof. W. B. Rogers on, 419 ; ditto 

 of the United States, Prof. W. B. 

 Rogers on lowest group of, 394; dis- 

 cussion on, 396, 398. 



Paludina histrica, Gould, 41. 



Pandion Carolinensis, Notes on, 105. 



Panop^a generosa, animal of, 32. 



Paradoxides Harlani, identical with P. 

 spinosus, 370; P. noviapertus the 

 same as P. Harlani, 86; P. Harlani 

 from calcareous slate at St. Mary's 

 Bay, Newfoundland, 54, 75 ; measure- 

 ments of, 75; Paradoxides at Brain- 

 ti-ee, question of age of rock containing 

 it, 427 ; not identical with P. spinosus 

 of Bohemia, 427. 



Parasite from Alligator, 278 ; from brain 

 of Anhinga, 27». 



Patella grata, Gould, 161. 



pallida, Gould, 162. 



Paxillus lyratus, Gould, 138. 



iantillus, Gould, 138. 



Pearl, " cocoa nut," 229 ; report on, 290 ; 

 chemical composition of, 291; micro- 

 scopical characters of, 291. 



Peat water, action of, on lime, 151. 



Peat marl from Baisle^'^'s Pond, Long 

 Island, 80. 



Pebbles, distorted, of Vermont con- 

 glomerate, Pi'of. Edward Hitchcock 

 on, 353 ; theory of their distortion, 

 353; Mr. Edward Hitchcock, Jr., on, 

 208 ; ditto, of Fall River conglomerate. 

 Prof. W. B. Rogers on the causes of 

 the form and arrangement of, 391. 



Pecten concentricus, remarks on, 78. 



Pelecanus Americanus,l8. 



fuscus, 18 ; fishing habits of, 



19; breeding-place of, 19; egg of, 20; 



Notes on, 122. 

 Pelicans, breeding habits of, in Florida, 



18. 

 Pentstemon breviflorus, 147. 



loetus. Gray, 147. 



ternalus, Gray, 147. 



Fei'istern'mfenestrata, Gould, 327. 



inculta, Gould, 328. 



Persicula taniilla, Gould, 384. 



Petrels, breeding-places of, on' Green 



Island, otr Nova Scotia, 368. 

 Peucsea aestivalis, supposed, (see p. 21,) 



stated to be Coturniculus Henslowi, 



74; P. Bachmaiji, 9. 

 Phaeton flavirostris, Notes on, 128; 



measurements of, 130. 

 Phoenicopterus ruber. Notes on, 121. 

 Philene aryentata, Gould, 139. 



vitrea, Gould, 139. 



Philhps, Hon. Jonathan, Bequest of, 



355. 

 Pholas borings disproving Darwin's 



statement that the edges of strata are 



destroyed during upheaval, 275 ; ex- 

 planation of, by Prof. W. B. Rogers, 



275. 

 Phy.seter macrocephalus. Dr. J. C. 



White on jaw of, 222; diseased tooth 



of, 225. 

 Pickerel, short or trout-nosed, 155; hab- 

 its of, Mr. G. Curtis on, 159. 

 Picus villosus, 106; P. varius, 106. 

 Pilumnus Harrisii, 77. 

 Pisania mollis, Gould, 327. 

 Planaxis cinyulata, Gould, 385. 



inepta, Gould, 385. 



Planorbis spirillus, Gould, 40. 



Plants of Sonoma County, California, 



142; ditto, from neighborhood of Fort 



Tejon, Caiilbrnia, List of, collected by 



L. J. Xantus, 145. 

 Platalea ajaja, 17, 21. 

 Platinum in black sand of Pacific coast, 



191. 

 Platyonychus ocellatus, 76. 

 Pollock, fishes in abdominal cavitv of, 



4. 

 Polyborus vulgaris, 6; measurements 



of, 7. 

 Polynoe, 79. 

 Polyp of family of Gorgonidae, from the 



depth of eighty fathoms in the Bay of 



Fundy, 418. 

 Polvps, Actinoid, new. Prof. Agassiz on, 



23. 

 Pomotis, forty-five species of in the 



United States, 4; P. obesus, 3; ditto, 



identical with P. guttatus, 34. 

 Potamochoerus albifrons, Du Chaillu, 



301. 

 Potamogale, nov. gen., Du Chaillu, 



363. 



