10 PEOCEEDINGS OF THE NATIONAL MUSEUM vod. 72 



Another specimen (Cat. No. 333803, U.S.N.M.) of this subspecies 

 is larger but somewhat abnormal in that the whorls at places do not 

 attach themselves accurately to the peripherj^ of the preceding whorl, 

 thus making the shell a little more elevated than it should be for its 

 diameter. It measures: Major diameter, 34 mm.; minor diameter, 

 33.5 mm. ; height, 25.6 mm. 



This subspecies resembles a typical Thersites hartschi hartscM very 

 much reduced in size. It resembles also Thersites tartschi oma 

 but is smaller, \h& whorls less rounded, the aperture very much less 

 flaring and with a light peripheral band instead of a dark chestnut- 

 colored one. 



THERSITES (HADRA) BARTSCHI NESIA, new subspecies 



Plate 3, fig. 5 



Shell very small, thin; whorls 51/2, rather flattened. Base very 

 convex, its depth exceeding the height of the spire ; umbilicus moder- 

 ate, but little concealed by the reflected columellar tip. Sculpture of 

 many fine retractive growth lines and microscopic reticulations. 

 Body whorl sloping, periphery rounded except in front of the aper- 

 ture where it is sharply angulated. Sutures not deeply impressed, 

 crenulated by the upper ends of growth lines. Aperture very oblique, 

 peristome white, slightly reflected. Color dark chestnut brown, the 

 base somewhat darker than the SjDire, the sutures margined by an 

 irregular darker band at the top of each whorl, the colors of the 

 base and spire divided by a narrow yellowish band at the perphery. 

 Interior dark brown below, whitish mottled with chestnut above and 

 a clear white band marking the periphery. 



The type (Cat. No. 333804, U.S.N.M.) measures: Major diameter, 

 25.5 mm. ; minor diameter, 22.5 mm. ; height, 20 mm. It comes from 

 Yam Island, Torres Strait, and was presented by Mr. C. Walton. 



The small size, the deep base, and the oblique aperture distinguish 

 this shell from all others of the group. Its nearest relative is 

 Thersites hartschi nura. 



THERSITES (HADRA) BARTSCHI PAULENSIS, new subspecies 



Plate 3, fig. 10 



Similar to Thersites hartschi hartschi^ but smaller, whorls a trifle 

 more rounded, base slightly more convex, aperture less flaring. Color 

 nearly uniform dark rich chestnut, a little darker on the base, darkest 

 just behind the aperture. The peripheral band is not whitish but 

 light chestnut. Interior sharplj^ divided into upper lighter and 

 lower darker portions by a very distinct white band. 



The type (Cat. No. 333805, U.S.N.M.) measures: Greater di- 

 ameter, 41 mm.; lesser diameter. 35 mm.; height, 28.5 mm. It and 



