PLANORBIS. 195 



8. PLANORBIS TUMIDUS, I^eiffer. 

 Plate 5, fig. 12, 13. 



Shell opaque, pale horn-colored or smoky, 

 densely and finely striated, umbilicated above, 

 slightly concave below ; whorls five, convex, 

 subcarinated on each side, rapidly increasing, 

 separated by a deep suture ; aperture oblique, 

 lunate-rounded, somewhat kidney-shaped. 



Diameter 19, alt. 6 mill. 



Texas (Mexico, Guatemala). 



I have no authentic specimens of this shell 

 to refer to, and can therefore only hazard a 

 conjecture that the species is identical with 

 glahratus. 



9. PLANORBIS HAVANENSIS, Pfeiffer, 



Plate 5, fig. 14, 15. 



PI. Liehmanni, Dunker. — Plate 5, f. 16, 17. 



Shell discoidal, thin, pale horn-colored or 

 yellow, very delicately and densely striate; 

 (42) 14 



