THE NATURAL HISTORY SURVEY. 2479 
the lower margin concave and the outer corners expanded; 
reflection small, low, tricuspid, the center cusp reaching about 
half way to the margin of the base of attachment, the side 
cusps very small; lateral teeth almost as wide as long, bicus- 
pid, the inner cusp long and wide, reaching below the base of 
attachment, the outer cusp short and blunt; marginal teeth at 
first a modification of the lateral teeth, the base of attachment 
being wider than high and the inner cusp gradually shorten- 
ing; as the margin is reached the teeth become eight-cuspid 
(serrated) and are very wide and low (Fig. 75). The cusps are 
all provided with strong cutting points. There are about go 
rows of teeth. 
Genitalia: See generic description. 
Distribution; North America, Europe and Asia; Point Bar- 
row, Alaska. (Lehnert.) 
Geological distribution: Pleistocene; Loess. 
Habitat: . Found plentifully under dead leaves and twigs, 
Fig. 75. 
Radula of COCHLICOPA LUBRICA Miiller. (Original.) c, central tooth; 
1, first lateral; 11, third marginal; 18, eighth marginal; J, jaw. 
under decaying bark of fallen trees, in moss, etc., at the base 
of very old trees. It prefers the open forest. 
Remarks: A species at once known by its cylindrical, 
shining, glossy shell. The young shell of this species might 
easily be mistaken for a small Hedx,; it is short and stumpy 
and the thickened peristome, so characteristic of the adult, is 
not developed. In many forms the edge of the lip of the 
adult shell is colored reddish-brown, and there is a yellowish- 
white line or band around the penultimate whorl, where the 
liver shows through the shell. It is an interesting species in 
captivity, the animal being very bold and readily crawling over 
