14 



H. suppressa. Shell subglobose, depressed, pale horn color, 

 polished, somewhat pellucid: body whirl opakc, whitish near 

 the aperture: volutions six, wrinkled: spire convex: aperture 

 sublunate, narrower beneath: within, a prominent tooth near 

 the base, distant from the margin: labrum simple: umbilicus 

 rather small, orbicular, profound: region of the umbilicus in- 

 dented. 



Greatest breadth, more than one fifth of an inch. Inhabits 

 Pennsylvania. 



I found a few specimens of this shell on the farm of my 

 friend Mr. Reuben Haines at Germantown. 



With the exception of size and the armature of the throat, 

 it has somewhat of the habit of H. ligcra, Nob.; but the opa- 

 city of the body-whirl near the aperture, is much more remark- 

 able: These characters, combined with that of the tooth, will 

 readily distinguish this species from any other. 



(Poligyra.) 



X H. faiigiata. Shell convex beneath, nearly plane above, the 

 spire being hardly perceptibly elevated: whirls a little over 

 six, compressed, acutely carinated, crossed by numerous, raised, 

 equidistant lines, which form grooves between them: superior 

 surface not at all convex: aperture subreniform: labrum reflect- 

 ed, regularly arquated, describing two-thirds of a circle; within 

 two toothed, lower tooth conic obtuse, superior tooth com- 

 pressed, transverse, placed farther within the aperture than the 

 inferior one, from which it is separated by a wide and deep and 

 obvious sinus: labrum with a very profound duplicature, which 

 has a concave surface, but no emargination near its acute tip: 

 beneath exhibiting only two volutions, without any distinct 

 groove on the external one near the suture; beneath the carina 

 the elevated lines are obsolete. 



Greatest breadth, seven-twentieths of an inch. 



Found by Mr. I.esueur in the vicinity of New Harmon}". It 

 is very closely related to that species which I described under 

 the name of ' plicata; the character of the mouth is very similar, 

 but in that shell, such is the situation and form of the teeth of 

 the labrum, that at first view they do not seem to be separated 

 by a remarkable sinus, and the inferior tooth is compressed and 

 larger than the other; the duplicature of its labium is emargi- 

 nate near the tip. The present species is also larger carinated, 

 and the elevated lines arc obsolete below the carina. 







