128 BOOK OF SPECIES. 
distinct; extremities slightly beaked; base sul- 
cated.) 1... W.17. 62: 
C. moneta. Ovate, marginated, yellowish 
white; margins tumid, white, and nodulous; base 
flattened and white. 14. W. 17. 43. 
C. annuLus. Ovate, gibbous, greyish yel- 
low, with the back surrounded by a yellow line; 
the margin whitish, depressed, and smooth. 2. 
W. 17. 44. 
C. rapians. Roundish, deep flesh-colour ; 
the dorsal line wide, on either side of which the 
thick radiating ribs, which cover the flattened 
base, and ascend to the back, end in. tubercles. 
2. W. 17.58. 
C. pepicuLus. Ovate, flesh-colour, often 
with a greyish tint, with several chocolate-brown 
spots, transversely ribbed; a narrow dorsal groove; 
base suleated. 2. W. 17. 59. 
3 
C. coccinELLA. Much resembles the last, 
but has no dorsal groove, not more than three 
spots; and the ribs much finer. B. 2. W. 17. 
60. 
TEREBELLUM. 
Convolute, sub-cylindrical, pointed at the summit ; 
margin simple and acute; aperture longitudinal, 
contracted at the upper part, notched at the 
base ; pillar smooth, truncated at the bottom. 
T.suBULATUM. Cylindraceous, subulate, thin, 
smooth, glossy, with a distinct spire; whitish, 
