388 A MANUAL OF AMERICAN LAND SHELLS. 



side ; in the latter the parietal tooth is arched itpicards and its outer 

 margin is rounded; in Henrietta it takes the opposite direction and its 

 margins fowiu almost a right angle; the deep pits behind the peristome 

 are wanting or obsolete in vultuosa. 



Triodopsis Copei, Wetherby. 

 Shell reddish, somewhat thin, deeply striated by lines of growth, qnd 

 Fig. 422. of mcdium size; spire somewhat depressed in some speci- 

 mens, slightly more elevated in others ; whorls 5, trans- 

 versely striated with oblique lines of growth and increasing 

 very gradually and regularly in size, a faint carina appear- 

 ing at the junction of the upper third and lower two-thirds 

 of the body- whorl, from which the latter tapers inwardly to 

 T. Copei. the base of the shell ; sutures regularly and moderately im- 

 pressed; peristome subacute and broadly reflected outward and down- 

 ward at its lower two-thirds, and bearing on its basal third an acute 

 carina, within which is seen a prominent, vertical, double tooth, of which 

 the outer portion is the larger; a second tooth is carried by the inner 

 margin of the peristome at the center of the bodywhorl, the point of 

 which is in close relation to an arcuate tooth carried by the parietal 

 wall of the aperture; umbilicus wide, exhibiting most of the volutions. 

 Height, 7""") lesser diameter, 12'""'; greater diameter, 14'"''\ This size 

 is about the average. (This reference is to the annexed figures.) 



This shell differs from the S. vultuosa, Gould, to which it is closely 

 allied, and of which it is perhaps but a very distinct variety, in the 

 following particulars: It is a larger shell, but of lighter texture; the 

 lines of growth are more deeply impressed, though this character might 

 not be constant in a larger number of specimens; the lip is much more 

 broadly reflected below, with a sharper central angle, and much more 

 produced outwardly at the point of junction of the upper third with the 

 lower two-thirds ; the umbilicus is much wider, exhibiting the volutions 

 more plainly ; the arrangement of the teeth is very distinct in the two 

 species or varieties under consideration. This shell I collected under 

 logs in pine woods, 20 miles north of Beaumont, in Hardin County, 

 Texas, where it was associated with the H. buccidenta, Gould; Zonites 

 intertextus, Binney; H. monodon, Kacket; Helicina tropica, Jan.; Zonites 

 demissus, Binney; and Zonites arhorciis, Say. I dedicate the shell, with 

 great pleasure, to my friend Prof. E. D. Cope. (Wetherby, Amer. Nat- 

 uralist, Vol. XII, March, 1878. No. 3, PP- 184-185.) 



To the original description of this species I add a fac-simile of the 

 originfil figure. 



