NATURAL SCIENCES OF PHILADELPHIA. 55 



Illustrations of some Fossils described in the Proceedings of the Academy of 



Natural Sciences. 



BY T. A. CONRAD AND WM. M. GABB. 



PI. 1, fig. 1, a, b, c, Myalina deltoidea Gabb, Proc. Acad. 1859, p. 297. 



PI. 1, fig. 2, Posidonia Mo ore i Gabb, Proc. Acad. 1859, p. 297. 



PI. 1, fig. 3, Myacites pensylvanicus Conrad, Proc. Acad. 1857, 

 p. 166. 



The first two, Myalina deltoidea and Posidonia Moorei are carbon- 

 iferous ; Myacites pensylvanicus is triassio, from Phoenix ville, Penn- 

 sylvania. 



Descriptions of New Species of American Fluviatile Gasteropods. 

 BY J. G. ANTHONY. 



Melania angustispira, Anthony. Shell thick, elongate, very slender ; color 

 reddish-brown, with a narrow pale line at the suture; whorls 9-10, lower ones 

 subconvex, smooth, upper ones flattened and carinate near their bases : sutures 

 slight; aperture narrow-ovate, within pale purple; columella regularly curved: 

 sinu3 not remarkable. 



Hab. Tennessee. 



My Cab. ; Cab. Hugh Cuming, London ; A. N. S. Philada. ; State Collection, 

 Albany, N. Y. ; Smithsonian Collection, Washington, D. C. 



Obs. May be compared with M. ezilis, Hald., than which it is more slender, 

 more attenuate, and of more solid texture ; its color is also entirely different, 

 being more like M. Warderiana, Lea, but wanting the peculiar bulbous form of 

 that species. The carinations do not extend to the three lower whorls ; upon 

 these they are entirely wanting. It is a peculiarly slender and graceful species. 



M. decorata, Anthony. Shell short, thick, ovate ; whorls about five, but 

 truncate so as to show only two or three remaining ; whorls prominently ribbed 

 and intersected by revolving strise, forming nodules where they cross each 

 other; dark bands also revolve around the whorls, giving them a highly deco- 

 rative appearance ; columella often thickened by a callous deposit ; sinus 

 small. 



Hab. Oostanulla River, Georgia. 



My Cab.; Cab Hugh Cuming, London; A. N. S. Philada.; State Collection, 

 Albany, N. Y. ; Smithsonian Collection, Washington, D. C. 



Obs. I collected some two hundred specimens of this species in Oostanulla 

 River, Ga., in 1853, and then supposed they would prove to be merely the 

 young of M. ccelatura, Con. Closer examination and comparison, however, 

 has convinced me that they are not identical. Many of the specimens are 

 decidedly mature, and differ from " ccelatura" by the greater regularity of their 

 folds, which are also interrupted by a revolving raised line near the sutures, 

 and by their dark bands and less elongate form ; cannot well be compared with 

 any other. 



M. adusta, Anthony. Shell conical, smooth, shining; color dark brown, 

 with a pale line near the sutures ; whorls 7-8, flat ; body whorl rather large, 

 subangulated and with somewhat coarse lines of growth ; sutures distinct, but 

 not remarkable ; aperture ovate, dark purple within ; outer lip curved, colu- 

 mella deeply rounded, a broad sinus at base. 



Hab. Tennessee. 



My Cabinet; Cab. H. Cuming, London; Cab. A. N. S. Philada.; State Col- 

 lection, Albany, N. Y. ; Smithsonian Collection, Washington, D. C. 



I860.] 



