338 NEW UNIONID^, MELANID^, ETC. 



Remarks. — A single specimen only was among the shells kindly sent to me from 

 the north of Georgia by Major Downie. It is very nearly the size, form and color of 

 the fruit of the Chincapin ( Castanea pumila). While it is closely allied to Tennesse- 

 ense (nobis), it may be distinguished by its lighter color, its longer fuse, and its less 

 indented outer lip. The lower part of the outer lip is much less prolonged. The 

 aperture is quite half the length of the shell. 



Trtpanostoma castaneum. PL 54, fig. 20. 



Testa Isevi, pyramidata, subtenui, castanea, obsolete fasciata; spira esserta, acuminata; suturis 

 impressis ; anfractibus instar novenis, planulatis ; apertura parviuscula, rhomboidea, intus dilute 

 purpurea ; labro acute, sigmoideo ; columella parum incrassata et valde contorta. 



Shell smooth, pyramidal, rather thin, chestnut-brown, obscurely banded; spire 

 exserted, acuminate; sutures impressed; whoi'ls about nine, flattened; aperture 

 rather small, rhomboidal, pale purple within ; outer lip acute, sigmoid ; columella 

 somewhat thickened and very much twisted. 

 Proc. Acad. Nat. Sci. 1868, p. 152. 



Hah. — Coosa River, Alabama, Dr. Sho waiter. 



My cabinet and cabinet of Dr. Showalter. 

 Diam, -35, Length '99 inch. 



Remarks. — There were five specimens received from Dr. Showalter, differing very 

 little in size or color. The purplish color of the aperture is caused by irregular 

 subcapillary bands, which pervade the whole interior surfiice. The apices of all 

 the specimens are eroded, and therefore I am unable to say whether the upper whorls 

 might be striate or not; but there is no appear-ance of striation. In outline this 

 species is very near to Cliristyi (nobis) and Whitei (nobis), but may easily be distin- 

 guished by the color inside and out. The channel is rather narrower and more 

 tortuous than in either. , The aperture is about three-tenths the length of the shell. 



Tetpanostoma Wheatleti. pi. 54, fig. 21. 



Testa Isevi, pyramidata, tenui, dilute rubiginosa, vel fasciata vel efasciata ; spira exserta, acuminata ; 

 suturis regulariter impressis ; anfractibus instar denis, planulatis, ad apicem carinatis ; apertura 

 parviuscula, rhomboidea, intus albida ; labro acute, sigmoideo ; columella ad basim parum incras- 

 sata et valde contorta. 



Shell smooth, pyramidal, thin, pale rubiginose, banded or without bands ; spire 

 exserted, acuminate ; sutures regularly impressed ; whorls about ten, flattened, 

 carinate at the tip ; aperture rather small, rhomboidal, whitish within ; outer lip 

 acute, sigmoid ; columella slightly thickened at the base and very much twisted. 

 Proc. Acad. Nat. Sci. 1868, p. 153. 



