146 



PROCEEDINGS OF THE ACADEMY OF [Marchj 



Fig. 6. 



single immature specimen was taken by Rev. E. H. Ashmun in drift 



of the Salt river, at Tempe, Arizona. 

 Remarkable for its ample umbilicus. The freshest specimens are 

 about the color of Pupoides marginatus. None 

 were taken alive. In the adult shell opened 

 (fig. 6) the parietal and columellar lamellae do 

 not enter deeply, though they go so far that the 

 inner end cannot be seen in the mouth. One 

 l^roken shell from Tempe, taken by Mr. Ashmun, 

 and which has been in coll. A. N. S. P. for some 

 years, has a strong lamella on the columella, ap- 

 parently at least a half-whorl long, but not pene- 

 trating much farther than fig. 7 shows. This 

 lamella may perhaps be developed during the 

 latter part of the neanic stage, to be resor]:)ed 

 in the fully adult condition. Further material 



is needed to demonstrate this. It is possible that the Tempe shell 



represents a distinct species. It tapers slightly more than the types 



from Benson. 



Fig. 7. 



