286 • rOTAMIDIN^. 



maculosus, Martyn. Sinensis, Omel. 



Martinianus, Pfeiff. Sowerbyi, Kien. 



pharos, Hinds. subulatus. Lam. 



pictus, Wood. tseniatus, Quoy. 



rugatus, Martyn. torulosus, Linn. 



semigrauosus, Lam. vulgaris, Schum. 



Genus COLINA, H. and A. Adams. 



Shell elongated, tumid in the middle, many-whovled ; 

 whorls rounded, longitudinally ribbed and nodose, trans- 

 versely striated ; aperture oval, produced in front into a 

 short, recurved canal ; columella simple, oblique ; outer 

 lip expanded, the margin reflexed, 



Ea;. C. macrostoma, Hinds, -pi. 30, fig. 2. 



In this curious little group the middle whorls of the 

 shell are gibbous, and the last whorl is nearly smooth and 

 somewhat pellucid ; the outer lip, moreover, is remarkably 

 dilated and reflexed. The species known are inhabitants 

 of deep water, living in coarse sand among the Philippine 

 Islands, and in the China Sea. 



Species of Colina. 

 macrostoma. Hinds. pupiformis, A. Adams. 



Sub-fam. POTAMIDIN.E. 



Operculum circular, of many whorls. 



Shells usually covered with a brown epidermis ; the 

 fore part of the aperture more or less channelled, not 

 produced into a beak. 



Inhabiting the mouths of rivers, or salt marshes. 



