146 PROCEEDINGS OF THE ACADEMY OF [March 
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 lamelle do 
not enter deeply, though they go so far that the 
inner end cannot be seen in the mouth. One 
broken shell from Tempe, taken by Mr. Ashmun, 
and which has been in coll. A. N.S. P. for some 
years, las 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 
a lamella may perhaps be developed during the 
Fig. 7. latter part of the neanic stage, to be resorbed 
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. 
