190 HELICID^E. 



by a well-defined suture, the exterior one somewhat 

 angular at periphery. Beneath, well rounded, and per- 

 forated by a deep umbilicus, about one-fourth as broad 

 as the base. Aperture rather large, lunate ; lip moder- 

 ately reflexecl, tortuous, white, having at the base a 

 small tooth, and at the centre a deep seated, more ex- 

 panded, reflexed tooth. The columella bears a stout, 

 elevated, arcuated, oblique lamella, joined to the lower 

 extremity of the lip only. 



Diameter two-fifths of an inch, axis one-fifth of an 

 inch. 



GEOGRAPHICAL DISTRIBUTION. Found by Mr. Bart- 

 lett in Texas, near Corpus Christi and Galveston. 



REMARKS. At first glance this might be regarded as 

 an immature form of H. inflecta. It is generally smaller 

 and more convex, has a narrower aperture more nearly 

 closed by the pillar-tooth, the basal tooth is more devel- 

 oped, and the median one is deeper seated, and remark- 

 ably directed backwards into the aperture. From H. 

 Texasiana, it differs in having an open umbilicus, and by 

 having no line of callus connecting the pillar-tooth with 

 the upper angle of the lip, thereby forming a reentering 

 angle. It is, in truth, intermediate between H. fallax 

 and H. Texasiana. [G.] 



