CYPR.EA. 175 



spots, and the comparative absence of the hieroglyphic markings 

 so peculiar to the typical C. Arabica. 



The young shell is very much like that of Arabica. The small 

 variety, C. intermedia, Gray (fig. 20), differs in having a 

 creamy-white base without the brown blotch, it being ornamented 

 instead with numerous small brown spots that extend over the 

 margins ; the dorsal spots are much smaller. Length, 11*8 inches. 



By an error of the printer the illustration of fig. 20 is marked 

 rj natural size. The figures should be erased. 



* 



C. HISTRIO, Meusch. PI. 8, figs. 25, 26. 



More pyriform than C. reticulata, sides less thickened, base 

 white, without the brown-blotch ornamentation. 



Length, 2*5-3 inches. 



Tonga Tabou ; Indian Ocean. 



Although some monographers have placed this with the 

 synonomy of C. reticulata, yet I have always been able to sepa- 

 rate the two. There is, however, a close relationship between 

 Arabica, reticulata and histrio, but not more so than is to be 

 found in many other groups belonging to this interesting family. 



C. ARABICULA, Lam. PI. 9, figs. 35, 36. 



Bluish green, very closely reticulately painted with brown; 

 margins reddish brown and spotted with black, extremities pro- 

 duced angularly, base whitish, teeth fine, deeply cut. 



Length, '9-1 '2 inches. 



Acapulco ; Gulf of California (Stearns). 



C. GEMMULA, Weink. PI. 7, figs. 15, 16. 



Grayish yellow, longitudinally closely lined with chestnut- 

 brown ; margins like those of the preceding species. 



Length, about '8 inch. 



Red Sea. 



Weinkauff says of this species that it presents on the dorsal 

 surface, the appearance of C. Arabica in miniature, while its 

 base resembles arabicula. 



C. STERCORARIA, Linn. PI. 9, figs. 27, 28. 



Greenish blue, the brown spots frequently running together, 



