176 CYPFUEA. 



giving the back a clouded appearance ; sides and base brown ; 

 teeth whitish. Length, l'S-3'2 inches. 



West Africa. 



Young shell ashy brown, banded. When the shell presents a 

 humped appearance on the back, it forms the C. ralta*, Lam., 

 which can hardly be said to be even a variety, since the young 

 shells of stercoraria are all more or less humped. 



C. SCOTTI, Brod. PI. 9, figs. 29, 30. 



Pule ashy blue, clouded with yellowish brown ; sides and base 

 very dark brown ; aperture narrow ; teeth small, nearly obsolete 

 on the coluiiH'llar side. Length, 2'8-3"5 inches. 



Wext Australia. 



A peculiar oblong boat-shaped shell with the extremities pro- 

 duced and curved upwards. 



C. THEKSITES, Gask. PI. 9, figs. 31, 32. 



Shorter and more gibbous than C. Scotti, teeth on the outer 

 lip much stronger ; the colors are deeper and the dorsal spots 

 are more clouded ; base near the aperture white. 



Length, 2-75-3 inches. 



South Anal ml io. 



Specimens of this richly-colored shell huve been found painted 

 almost jet-black. 



C. MARGINATA, Gask. PI. 9, figs. 33, 34. 



Very light brown, some of the dorsal spots running together, 

 giving an irregular lined appearance. Length, 2*25 inches. 



* A Hal re Ha. 



This shell has such an immature look that it is most likely the 

 young of C. thersites. It is very rare. 



C. DECIPIENS, E. A. Smith. PI. 10, figs. 39, 40. 



Smaller than C. thersites, back higher and more humped, 

 base flatter and of a rich orunge-red color, which extends over 

 the sides of the shell ; body-whorl within the aperture, white. 



Length, 2*25 inches. 



North Australia. 

 C. VENUSTA, Sowb. PI. 10, figs. 44, 45. 



Cream-color with a cinnamon tin^e, variegated with rather 

 large orange-brown spots of irregular size, and irregularly dis- 



