THE BOOK OF SPECIES. 
C. rascicuLaris. Cinereous; when perfect, 
the whole surface of the valves appears covered with 
fish-like scales, except the beak, which is smooth, 
and of a yellower colour than the rest; margin 
with lateral tufts of hair. B.2...4. W.1.19. 
C. marcinatus. Dingy brownish or red- 
dish; with eight carinated, most minutely sha- 
greened valves; margin serrated and reflected. 
fod OW, 1.30. 
C. maeniricus. Large, ovate, flattish, sub- 
carinated, dark olive; the extreme valves with ra- 
diating granular striz ; the middle ones transverse 
and straight, with their centres very finely and 
irregularly striated, and their lateral areas with 
transverse granular grooves; margin dark olive- 
green, sometimes zoned with black granular 
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