427 



Ego;-case of Skates, Prof. J. Wyman's 

 observations on its formation, 376. 



Egg of Slellisuga anna, 148 ; of Scoleco- 

 pliagus Mexicanus, 148. 

 • Electric apparatus of Raia batis, 44. 



Elephant Fossil, from Brazos River, 51. 



Elk Run, Va., Copper Mine at, 18.3. 



Elm, Involuted growth of, 289. 



Embryological characters of Garpikes, 

 48. 



Embryology of Acantheus Americanus, 

 37. 



Encrinal Limestone of Wisconsin con- 

 taining Bitumen, 309. 



Engraving "Nature's Own," 280. 



Entomological Collection of Dr. T. W. 

 Harris, its purchase for the Society, 

 416. 



Epidermis, from mouth of Pristis sagit- 

 tata, 67. 



Equus major, from Brunswick, N. Y. , 

 Dr. Skilton on, 303. 



Eriophilus, nov; gen. Hald., 402. 



mali, " 403. 



Erismatura Dominica from Lake Cham- 

 plain, 343, 375. 



Erosion of Alasmodonta arcuata, Cause 

 of, 258; of Freshwater shells, 57; Dr. 

 James Lewis on, 149. 



Erythrospiza purpurea, 118. 



Esox, Varieties of, 430. 



Eupagurus, Samtielis, Stimpson, 86. 



turgidus, '' 86. 



European Widgeon from New Jersey, 

 376; breeds on L. Island, 419. 



Excursions, 10; to Hingham, 19. 



Exocetus, Dr. Weinland on, 385. 



Ej'e of Sperm Whale, 125. 



Eye piece, Orthoscopic, 246. 



Families of Turtles, Proper characters 

 of, 64. 



Fecundation of Turtles, 10. 



Feeding and growth of American robin, 

 396. 



Filaria in Cervus Virginianus, 395. 



Fish, tlying. New division of, 385. 



Fishes, Prof. Agassiz on Classification 

 of, 407 ; Habits of, Capt. N. E. Atwood 

 on, 175; Blind, of Mammoth Cave, 

 Anatomy of, 72. 



Fishes, European, Transplanting of, 

 369. 



Fishes, Fossil, from Ohio, 18. "-"^^ 



Fishes, Jamaica, Prof. Agassiz on Hill's 

 Catalogue of, 414; Lophobranchious, 

 method of locomotion in. Dr. D. F. 

 Weinland on,'<346 ; Migration of, 125, 

 419; new species from Nicaragua, 

 408 ; ovarian impregnation in, 10 ; 

 from Surinam, 328; fish from North 

 Atlantic, probably a new species, 

 280 ; dropped on land during a show- 



er, 2^3: Fish Scales, of bony struc- 

 ture, 285 ; Fluorine in, 366. 



Flight of Lepidoptera, Mechanism of, 

 426. 



Florida Pomocentridaj, New species of, 

 411. 



Fluorine in fish scales, 366. 



Flycatcher, Canada, Nest and eggs of, 

 found in Lynn, Mass., 5. 



Fly, House, Parasitic plant on, 337. 



Flving fish. Proposed new division of 

 them, by Dr. Weinland, 385. 



Foetus, liuman, of third week. Dissection 

 of, by Prof J. Wyman, 336 ; Analogies 

 of its transient conditions, 336; Para- 

 sites in, 26. 



Foetal pigs. Remarks on, by Prof. J. 

 Wyman, 363; foetal porpoise, 71. 



Food of Robin, Discussion an, 399, 403. 



Footprint, biped web footed. Fossil, 10. 



Foraminifera exhibited, 246. 



Forms of Birds, related to structure, 

 410. 



Fossil, biped webbed footprint, 10. 



Fossil crustacean impressions, in Wis- 

 consin, 310. 



Fossil bones of Suidse from Iowa, 8 ; Fos- 

 sils, American, Oldest, 310; Fossils, 

 Proposed exchange of, 231 ; from 

 Brazos River, Texas, 51 ; of Deep 

 River Coal formation, 32; Fossil-Ele- 

 phant from Brazos River, 51 ; Fossil 

 fishes from Ohio, 18; ditto Starfish 

 from Lewiston, Me., 394. 



Freshwater Shells, Cause of erosion of, 

 149. 



Fungi, New England, List of, by C. J. 

 Sprague, 316. 



Fungus, Parasitic, on a Beetle, 26. 



Ganoids, a Natm-al group, 63. 



Gar-pikes, Embryological characters of, 

 48; Affinities of to reptiles, 48; and 

 Sturgeons, Resemblances of, 63, 



Garrulus cristatus, 118; Canadensis, 118. 



Gas, burning jets of. Sonorous action of, 

 333, 339, 346. 



Generation, Alternation of, in Trematoda 

 of Freshwater Shells, 24. 



Geographical distribution of North 

 American Turtles, Prof. Agassiz on, 5. 



Geological Section, from Greenfield to 

 Charlemont, Mass., Diagram of, 330; 

 Description of Section, by C. H. Hitch- 

 cock, 330; Remarks on, by Prof. W. 

 B. Rogers, 332; on Map of Pennsyl- 

 vania, 378; of New Mexico, 368. 



Georgia, Peculiarities of Helix thj'roi- 

 dus in, 129. 



Gestation of Aspredos or Trompetti, 

 269. 



Glseosporium crocosporum, Berk, and 

 Curt., 282. 



