266 AMERICAN JOURNAL 



* 



Mexican Species. 

 Pseudohyalina Mazatlanica, Pfeiffer. 



Plate 4, figure 59. 



Depressed, umbilicate, costato-striate, corneous ; whorls 4, 

 somewhat convex, the spire slightly raised ; last whorl narrow, 

 scarcely descending at the aperture ; umbilicus equalling ^ of 

 the diameter; aperture oblique, lunately rounded, its margins 

 approaching. 



Diam. 2'3 ; altitude 1 mill. 



Mazatlan, Mexico. 



