SCABRICOLA. 133 



last whorl, and with the other parts of the shell slightly mottled 

 with white, except the sutural portion. Length, 1*75 inches. 



Hab. uncertain ; probably East Indies. 



Narrower than M. impressa, of which, nevertheless, it may be 

 only a variety. 



M. GRANULOSA, Lam. PL 38, fig. 138. 



Orange, or sometimes chestnut-brown ; occasionally obscurely 

 banded, or with the granules next the suture lighter colored. 



Length, 1-1-5 inches. 



West Indies ; on rocks. 



M. ONISCINA, Lam. PI. 38, fig. 135. 



Chocolate-brown, with a superior white band, and an inferior 



one less distinct. Length, -6-1-2 inches. 



East Indie*. 



An obscure species figured by Kiener, and not recognized by 

 subsequent naturalists. 



M. LENS, Wood. PL 38, figs. 133, 137 ; PL 39, figs. 140-142, 144. 



Ashy violet or brownish white, covered with a dark epidermis, 

 varying from chocolate to nearly black. Length, 2-2 -5 inches. 

 Peru ; Panama ; Mazatlan ; Galapagos Is. 



The dark color and very coarse, rude sculpture of this species 

 will readily distinguish it from all others ; there is, besides, on 

 well-grown specimens, two rows of very deep punctures, encir- 

 cling the middle of the whorls. The Peruvian locality is on the 

 authority of d'Orbigny, who has described a young shell as M. 

 inca (fig. 140). M. Dupontii, Kiener (fig. 137), is said to come 

 from the Red Sea, but I agree with Reeve and Sowerby that it 

 is a synonym of M. lens, and the habitat is very doubtful. M. 

 lignaria, Reeve (fig. 141), dredged at fourteen fathoms from 

 rocky ground, at St. Elena, W. Columbia, is merely a lighter 

 colored variety, somewhat narrower than the usual form. M. 

 rupicola, Reeve (fig. 144), obtained with the last, and unique in 

 the Cumingian Collection, is a M. lens, more shouldered than 

 usual ; I have before me shells somewhat like it. M. muricata, 

 Swainson (fig. 142), cannot be distinguished from a very usual 

 form of young specimens of M. lens ; Cuming obtained it at the 

 Galapagos Isles, from sandy mud, at six fathoms. 



