Notes on American Land Shells. mes 
found by myself and several members of our party, in various stages 
of growth. The adult shell is smaller than the average perspectiva. 
The spire is more nearly planiform. The umbilicus is more widely 
open, and the shell is more depressed below. The open character of 
the umbilicus and the depression of the spire makes it as easy to de- 
termine the number of whorls from below as from above. ‘The whorls 
increase very gradually in size, and are heavily ribbed above and be- 
low, the ribs terminating at a sharp angle on the upper and under 
outer edge of the body whorl, leaving a space between which is com- 
‘paratively smooth. The body-whorl is thus rendered distinctly bicar- 
inate, and as the space between the carine is comparatively smooth, 
and not convex, but sloping inwardly from the upper to the lower 
carina with a plain surface, the periphery of the whorl has a flattened 
appearance, and the aperture is rendered very nearly quadrate. The 
upper carina overhangs the plainer, flattened side of the body whorl, 
and the lower extends beyond it, so that the outer wall of the whorl 
has a concave external section everywhere, except for a short space 
immediately back of the aperture. The upper surface of the body 
whorl is deflected below the upper carina for a short distance back of 
the aperture. 
The station of the species was under rotting logs and in them, being 
precisely that of perspectiva. I always found them solitary, and very 
rare. Perspectiva usually occurs in colonies. The animal is slender, 
pale bluish white, very sluggish and timid. The tooth on the base of 
the shell which is a character of P. perspectiva is entirely wanting in 
this species. 
31. Lebennophorus carolinensis, Boze.—This mollusk was abundant 
in its usual stations, and presented a great variety in coloration. Its 
distributions did not seem to be limited by a question of altitude. 
32. Stenotrema stenotremum, Fir.—Comparatively rare, “spiral 
lines at base notch strongly developed.” Bland. 
33. Stenotrema hirsutum, Say.—An elevated, somewhat carinated 
variety, in striking contrast with the globular form so common in 
Tennessee. A series of figures illustrating the varieties of this species 
would be of high interest. It differs as much as any species of N. 
A. Helix. This carinated variety has a remarkable development of 
the notch on the lower lip. 
34. Triodopsis inflecta, Say.—Rare, occurs with the next. 
35. Triodopsis rugeli, Shuttel.—Two varieties of this species occur, 
and what is remarkable are found together, The larger variety is more 
