170 . CYPR^EA. 



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

 teeth whitish. Length, 1-8-3-2 inches. . 



West Africa. 



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

 humped appearance on the back, it forms the C. rattus, Lam., 

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

 shells of stercoraria are all more or less humped. 



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



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

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

 on the columellar side. Length, 2-8-3*5 inches. 



West Australia. 



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

 duced and curved upwards. 



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



Shorter and more gibbous than G. 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 Australia. 



Specimens of this richly-colored shell have been found painted 

 almost jet-black. 



C. MARGINATA, Cask. PL 9, figs. 33, 34. 



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

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



A u sir alia. 



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

 young of C. ther 'sites. It is very rare. 



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



Smaller than C. ther sites, back higher and more humped, 

 base flatter and of a rich orange-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. PL 10, figs. 44, 45. 



Cream-color with a cinnamon tinge, variegated with rather 

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



