IMBRICAR1A. 199 



Genus IMBRICARIA, Schumacher. 



Distinguished by its Conns-like shells, the columella with less 

 numerous plications than most of the species of Cylindra. The 

 transition between this genus and the latter is gradual, some of 

 the species placed in Cylindra, such as C. dactylus, being almost 

 cone-shaped. 



I. CONICA, Schumacher. PI. 58, fig. 673. 



Yellowish or ash-color in darker and lighter clouds, encircled 

 by equidistant narrow brown lines, and mottled by quadrangular 

 white spots. Length, 1 inch. 



Philippines ; Polynesia. 



Gregarious in sand in sheltered places inside the reefs. It is 

 the Mitra marmorata of Schuberth and Wagner, and the type of 

 Swainson's genus Comnlix. 



I. CROUANI, Crosse. PL 58, fig. 674. 



Violet flesh-color, with irregular longitudinal whitish streaks; 

 smooth. Length, 15 mill. 



Galapagos. 

 I. CONULUS, Lam. PI. 58, fig. 672. 



Smooth, distantly spirally grooved at the base ; yellowish 

 brown, under a thin olivaceous epidermis, with revolving black- 

 ish or brownish lines. Length, 1-1-25 inches. 



Philippines, in mud at the roots of mango trees. 



I. CITRINA, Reeve. PL 58, fig. 615. 



Smooth spire with rows of small tubercles ; orange-brown, 

 stained with livid chestnut. Length, 1-5 inches. 



Habitat unknown. 



I. CARBON ACE A, Hinds. PL 58, figs. 676, 677. 



Spire smooth, body-whorl with a few engraved revolving lines 

 towards the base ; black, with traces of darker revolving lines. 



Length, -9 inch. 



Gape of Good Hope. 



Possibly equivalent to the preceding species. Yery probably 

 I. Rollandi, Bernardi (fig. 67 7), described from a somewhat worn 

 specimen, locality unknown, belongs here, although the spire is 

 somewhat different. 



