[54 ] 

 Mexican Species. 



Pseudcfhyalina Mazatlanica, Pfeiffer. 



Plate 4, figure 59. 



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

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

 scarcely descending at the aperture ; umbilicus equalling ^ of 

 the diameter ; aperture oblique, Innately rounded, its margins 

 approaching. 



Diam. 2'3, altitude 1 mill. 



Ma^iatlan, Mexico. 



