PLANORBIS. 195 
8. PLANORBIS TUMIDUS, Pfeifer. 
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 
glabratus. 
—_—— 
9. PLANORBIS HAVANENSIS, FYeifer. 
Plate 5, fig. 14, 15. 
Pl. Liebmanni, Dunker.—Plate 5, f. 16, 17. 
Shell discoidal, thin, pale horn-colored or 
yellow, very delicately and densely striate ; 
(42) 14 
