THE BAHAMA ISLANDS 37 



Cepolis (Hemitrochus) exumana n. sp. 

 Plate XIII, Pigs. 4, 7. 



Shell small, solid, turbinate, with five moderately convex whorls, evenly 

 rounded at the periphery; nuclear whorls polished, translucent, usually dark 

 brown or darker than the rest of the shell; sculpture of fine, small, sharp riblets, 

 in harmony with the lines of growth, with equal or wider interspaces, and less 

 •evident on the last whorl ; color very variable, sometimes unicolor, from creamy 

 white to dark brown without bands ; other specimens are banded with brown on 

 a creamy ground, generally darker above, lighter below, and with a dark 

 brown narrow peripheral band above a narrow white one ; some are brown with 

 a peripheral and a subsutural narrow white band, or numerously banded on a 

 lighter ground, or with the bands broken up into delicate pencillings; the last 

 whorl descends slightly at the aperture, which is quite rounded, with a strong 

 reflected peritreme, whitish or bright rose pink; the lip is reflected over and 

 nearly closes the umbilicus; there is little callus on the body, no gular fold, 

 and the throat is usually dark colored. Height 10, max. diameter 13.5, min. 

 diameter 11 mm. 



This pretty species was collected on Exuma Island by Dr. J. J. Brown. 

 It is nearest to C. penicillata, Gould (not Poey) from Matanzas, Cuba, which 

 is a less solid, slightly larger shell with a lump on the basal side of the aperture 

 when fully mature, while the present species has no trace of any gular fold. 

 Types 37668-9, U. S. National Museum. 



Cepolis (Plagioptycha) gregoriana n. sp. 

 Plate XIII, Figs. 5, 8. 

 Shell depressed with four and a half whorls, a strongly marked suture, and 

 narrowly perforate umbilicus; periphery evenly rounded, often marked by a 

 narrow pale band; sculpture, following a smooth nucleus, of numerous, sharp, 

 low close-set riblets, in harmony with the lines of growth, separated by slightly 

 wider interspaces and evenly covering the whole shell ; the surface is dull, not 

 polished, and the color a more or less pronounced reddish brown; the last whorl 

 near its termination is sharply constricted and depressed, its margin expanded 

 and below slightly reflected, especially over the umbilicus, but above simple and 

 sharp; a prominent white gular fold is set obliquely within the aperture, which 

 is very oblique; aperture oval, with a thin callus on the body. Height 7, max. 

 diameter 15, min. diameter 11.5 mm. 



