1909.] NATURAL SCIENCES OF PHILADELPHIA. 509 
low but distinct branch runs towards the outer termination of the lip, 
This branch is brownish, like the callus 
it rests upon, hence might easily be 
overlooked. The outer lip-tooth is 
slightly emarginate at the top, and 
curves inward. ‘The outer basal tooth 
is compressed and larger than the inner 
one, which is also somewhat compressed. 
Alt. 8, diam. 16 mm.; diam. of aper- 
ture 7.9 mm.; whorls 65. 
Description and figure from the type 
specimen, No. 1,274 of the Binney and 
Bland Collection, American Museum of 
Natural History, New York. We owe 
the opportunity of studying this speci- 
men to the kindness of Dr. L. P. Gratacap. 
Some specimens from Miller Canyon 
are identical in characters with the type 
of levettei. It probably was collected in 
that canyon. 
In Carr Canyon there is a similar 
race having some differential characters. 
Dr. Henry Skinner collected a series of 
several hundred shells. They were 
taken about midway of the canyon as 
shown in the map. These shells vary 
in size: 
Alt. 6, diam. 13 mm.; whorls 64. 
sled iy ieee aaa 6H. 
Seale) Por! 4)) diam: “aperture 7 mim, ; whorls 64. 
The last whorl is rather depressed and periphery is shghtly angular 
in front, these being the main differences from typical A. levetter. In 
some specimens the shape of the aperture and of the parietal tooth is 
exactly as in levettei, but most examples have the aperture smaller, 
the lip-ends approaching somewhat more, and connected by the thick- 
ened edge of the parietal callus. The parietal tooth almost always 
is recurved at the axial end, and bears a more or less distinet recurrent 
branch from the distal end, as in levettei. In some examples, however, 
the parietal tooth is straight and there is no perceptible outer branch; 
the upper margin of the lip descends more deeply on the parietal wall 
than in the type of levette?. The young snails form a very thick lip- 
callus at resting stages. 
Fig. 8. Ashmunella levettet 
(Bland). Type specimen. 
