342 NEW UNIONID^, MELANID^, ETC. 



Remarhs. — This species, of which there are four specimens before me, is nearly 

 allied to Wheaileyi (nobis), herein described. It differs in being more yellow, in 

 being striate and being more cylindrical. The bands are not so well pronounced 

 inside or out. Three of the specimens are four-banded ; the fourth entirely without 

 bands on the inside. There is a slight disposition to yellowishness in the interior. 

 All the specimens being eroded at the tips the number of the whorls cannot be 

 ascertained. 



ScHizosTOMA Wheatleyi. PI. 54, fig. 27. 



Testa striata, subfusiformi, subtenui, luteola, imperforata, vittata ; spira obtuso-conoidea ; suturis 

 irregulariter impressis ; anfractibus instar senis, ultimo grandi ; fissura obliqua brevique ; aper- 

 tura parviuscula, ovata, intus alba et vittata ; labro subcrenulato ; columella alba incrassata et 

 contorta. 



Shell striate, subfusiform, rather thin, yellowish, imperforate, banded ; spire 

 obtusely conoidal ; sutures irregularly impressed ; whorls about six, the last large ; 

 fissure oblique and short ; aperture rather small, ovate, white and banded within ; 

 outer lip somewhat crenulate ; columella white, thickened and twisted. 

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



Hah. — Coosa Kiver, Dr. Showalter. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. "35, Length '70 inch. 



Remarlcs. — A single specimen only was received from Dr. Showalter, to whom I 

 have been indebted for so many species of this genus. In outline it is very close to 

 S. excisa (nobis), as well as in color, bands and striae ; but it differs entirely in the 

 fissure, which in Wheaileyi is shallow and oblique, while in excisa it is deep and 

 direct. There are four bands on this specimen, which show distinctly on the inside. 

 The aperture is not half the length of the shell. 



I name this species after my friend Mr. C. M. Wheatley, who has greatly 

 promoted the knowledge of our fresh-water Mollusca. 



Anculosa Downiei. pi. 54, fig. 28. 



Testa plicata, et obsolete striata, subglobosa, crassa, tenebroso-oliva, maculata; spira vix prominulis, 

 plicatis ; suturis impressis ; anfractibus vix ternis, ultimo grandi et ventricoso ; apertura grandi, 

 subrotunda, intus fusco-maculata ; labro acuto ; columella impressa et incrassata. 



Shell plicate and obscurely striate, subglobose, thick, dark olive, spotted; spire 

 very little prominent, folded ; sutures impressed; whorls scarcely three, the last 

 large and ventricose ; aperture large and subrotund, within brown spotted ; outer lip 

 acute ; columella impressed and thickened. 

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



