OF CONCHOLOGY. 155 



MONOGRAPH OF THE TERRESTRIAL MOLLUSCA OF THE 

 UNITED STATES. 



BY GEORGE W. TRYON, JR. 

 [Coutinued from page 68.] 



** Aperture expanded, ear-shaped, its margin continuous ; up- 

 per lip tooth hook-sha^Jed. 



20. Dsedalochila auriformis, Bland. 



Plate 11, figures 1, 2, 3. 



Depressed and ribbed-striate above, periphery subangular, 

 convex and smooth beneath ; whorls 5| — 6, suture moderate, the 

 last one slightly deflected and expanded at the aperture into an 

 ear-shaped lip, behind which it is constricted ; the base shows 

 nearly two whorls, and a minute perforation, and a deep groove 

 revolving on the inner side of the whorls ; aperture ear-shaped, 

 the peristome continuous and expanded, parietal tooth linguiform, 

 two lip teeth, the upper one of which is a submarginal perpen- 

 dicular lamella, and the basal one an oblique fold. White or 

 brownish horn color. 



Diam. 10, alt. 5-5 mill. 



Alabama; Texas. 



Differs from D. avara in having an umbilical groove. 



21. Dffidalochila avara, Say. 



Plate 11, figures 4, 5, 6. 



Spire depressed, periphery slightly angular ; whorls 5, 

 slightly convex above, with moderate suture, coarsely ribbed, 

 hirsute, convex below, and ribbed only for a short distance be- 



