BOOK OF SPECIES. 



C. FASCicuLARis. Ciiiereous ; wlieii 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. f . . 4. W. 1. 19. 



C. MARGINATUS. Dingy brownish or red- 

 dish; with eight carinated, most minutely sha- 

 greened valves ; margin serrated and reflected. 

 B. |...^. W. 1.30. 



C. MAGNiFicus. Large, ovate, flattish, sub- 

 carinated, dark olive ; the extreme valves with ra- 

 diating granular striae ; the middle ones transverse 

 and straight, wdth their centres very finely and 

 irregularly striated, and their lateral areas with 

 transverse granular grooves ; margin dark olive- 

 green, sometimes zoned with black, granular. 

 3}. This of late has become common. 



