12 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 72 



The type (Cat. No. 333811, U.S.N.M.) measures : Greater diameter, 

 30 mm. ; lesser diameter, 25 mm. ; height, 21 mm. It and a paratype 

 (Cat. No. 333812, U.S.N.M.) come from Murray Islands, Torres 

 Strait, and were presented by Mr. C. Walton. 



THERSITES (HADRA) BARTSCHI DIVA, new subspecies 



Plate 2, fig. 2 



More elevated than Thersites hartschi frnna^ the whorls still more 

 rounded and more exserted, the base more convex, and the colors 

 lighter and less pronounced, the body whorl rounded, with no angle 

 at the periphery except just in front of the aperture. 



The type (Cat. No. 333813, U.S.N.M.) measures: Major diameter, 

 41.5 mm.; minor diameter, 35.5 mm.; height, 31.5 mm. It comes 

 from Murray Islands, Torres Strait, and was presented by Mr. C. 

 Walton. 



THERSITES (HADRA) BARTSCHI CEPA, new subspecies 



Plate 3, fig. 1 



Resembles Thersites tai-tschi diva^ but smaller, whorls not quite so 

 rounded, colors still less pronounced, the body whorl very faintly 

 angulated at the periphery, the angle more appreciable by touch than 

 by sight. 



The type (Cat. No. 333814, U.S.N.M.) measures: Greater diam- 

 eter, 38 mm.; lesser diameter, 32 mm.; height, 29 mm. It and a 

 paratype (Cat. No. 333815, U.S.N.M.) come from Murray Islands, 

 Torres Strait, and were presented by Mr. C. Walton. 



THERSITES (HADRA) WALTONI, new species 

 Plate 2, fig. 3 



Shell rather large, thin, much depressed, whorls 6I/2, flattened,, 

 slowly increasing. Body whorl abruptly descending near the aper- 

 ture, periphery rather sharply angulated. Sculpture of many 

 slightly retractive, nearly obsolete lines of growth, and a microscopic 

 reticulation which has a tendency to spiral arrangement. Sutures 

 not deeply impressed, crudely crenulatecl by the upper ends of the 

 growth lines. Base convex, its depth nearly equal to the height of 

 the spire. Umbilicus wide, but largely concealed by the reflected 

 columella. Peristome simple at its upper portion and not reflected 

 there. At the peripheral angle the peristome begins to expand and 

 is broadly reflected, especially at its junction with the parietal wall 

 which is covered with a thin glaze. Color of spire pale tawny, base 

 slightly darker, the darker shade more pronounced just behind the 

 aperture ; periphery marked by a fairly broad white spiral band. 



The type (Cat. No. 333816, U.S.N.M.) measures: Major diameter, 

 62 mm.; minor diameter, 46 mm.; height, 35 mm. It comes from 



