CHIEFLY OF THE UNITED STATES. 149 



sutures regularly impressed ; whorls eight, somewhat convex ; aperture elongate, 

 narrow-elliptical, whitish within ; outer lip acute and very sinuous ; columella thin 

 and twisted. 



Proc. Acad. Nat. Sci., 1864, p. 112. 



Hah. — Tennessee, Mr. J. G. Anthony. 



My cabinet and cabinet of Mr. Anthony. 

 Diam. -27, Length -76 inch. 



RemarTcs. — Two specimens were sent to me some years since by Mr. Anthony. I 

 do not know from what part of Tennessee they came. In these two specimens all 

 the whorls but the body whorl have six or ten transverse striag. The base of 

 the body whorl is striate. The base is prolonged almost into a channel, and thus 

 approaches the genus lo. In outline and color it is allied to T. veniistum, herein de- 

 scribed, but differs in not being fusiform, in having a larger aperture, and in having 

 striae. The aperture is more than one-third the length of the shell. 



ScHizosTOMA Showalterii. PL 23, fig. 56. 



Testa Isevi, cylindracea, producta, crassa, mellea, evittata ; spira exserta ; suturis valde impressis, infra 

 funiculo instructis ; anfractibus subplanulatis ; fissura parviuscula ; apertura parva, elliptica, intus 

 alba ; labro acuto, aliquanto sinuoso ; columella inferne et superne incrassata. 



Shell smooth, cylindrical, elevated, thick, honey-yellow, without bands ; spire ex- 

 serted; sutures very much impressed, furnished below with a cord ; whorls flattened ; 

 fissure rather small ; aperture small, elliptical, white within ; outer lip acute, some- 

 what sinuous ; columella thickened above and below. 



Operculum elongate, dark brown. 



Proc. Acad. Nat. Sci., 1864, p. 112. 



Hob. — Coosa River, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -54, Length 1-2 ? inch. 



Eemarks. — This species, of which I have but a single specimen, is the highest in 

 the spire of any I have seen, and it is to be regretted that it is not more perfect, the 

 three lower whorls only remaining. These, however, indicate a high spire, which is 

 not common in the genus. The lower whorl reminds one of constrictum, (nobis,) but 

 that species is short, not so thick, has a larger aperture, and the callus is not so thick 

 on the columella. It also has a constriction round the body whorl which this species 

 has not. It is also devoid of the well marked cord which runs round the sutures of 

 this species, which cord is very remarkable. There are a few iridescent striae on the 

 under part of last whorl in this specimen. Being an imperfect specimen, neither the 

 number of whorls nor the proportion of the aperture can be ascertained. In a former 



38 



