STOMATELLLV^K. 485 



semistriata, D'Ori. (Rotella). tricarinata, C. B. Adams 



striata, VOrh. (Rotella). valvatoides, C. B. Adams. 



tincta, C. B. Adams. 



Sub-fam. STOMATELLIN.E. 



Foot often very thick, fleshy, developed posteriorly. 



Operculum thin, horny, ovate, of few rapidly-increasing 

 whorls, often entirely wanting. 



Shell more or less ear-shaped, of few whorls ; aperture 

 very wide. 



Genus STOMATELLA, Lamarck. 



Animal spiral, retractile within the shell ; frontal lobes 

 triangular, their edge fringed ; foot small, not tubercular, 

 not posteriorly produced, opercuHgerous ; lateral membrane 

 very wide, the edge fimbriated. 



Operculum orbicular, thin, horny, many-whorled. 



Shell spiral, sub-orbicular, depressed, transversely ribbed 

 or sulciferous ; spire more or less elevated, whorls rounded ; 

 aperture large, wider than long. 



Ex. S. maculata, Quoy and Gaimard, pi. 49, fig, 8, 

 8, a. Operculum, S. sulcifera, Lamarck., fig. 8, h, 8, c. 

 Shell, S. imbricata, Lamarck, fig. 8, d. 



The Stomatelhe are most numerous in the Philippines, 

 sixteen species being inhabitants of those islands. 



Species of Stomatella. 



Arabica, A. Adams. biporcata, A. Adams. 



articulata, A. Adams. calliostoma, A. Adams. 



Bacoui, A. Adams. cancellata, Krauss. 



bicarinata, A. Adains. Candida, A. Adams. 



