222 ANCYLUS. 
2. ANCYLUS FUSCUS, Adams. 
Hald. Monog. p. 12, t. 1, f. 7. 
Massachusetts, District of Columbia, Ohio. 
3. ANCYLUS ELATIOR, Anthony. 
Plate 2, fig. 1, 2. 
Shell very much elevated, ovate; lines of 
growth distant, conspicuous; color light green, 
opaque; apex decorticated, recurved, subcen- 
tral; anterior and posterior slopes convex ; 
lateral slopes plane ; apical region rose-colored. 
Length 6-5, width 5, alt. 3°5 mill. 
Green River, Kentucky. 
This is rather a heavy, robust species, and 
one not easily confounded with any other; it 
most nearly resembles, perhaps, Ancylus cras- 
sus, Hald., but differs from it in being more 
elevated, in having the lines of growth 
coarser, and by its rosy apex. It is more ele- 
vated than any other species of the genus 
with which I am acquainted. 
(16) 
