8 PROCEEDINGS OP THE NATIOZSTAXi MUSEUM vol.72 



THERSITES (HADRA) BARTSCHI BARTSCHI, new subspecies 



Plate 2, fig. 1 



Shell rather thin, depressed, whorls 6^2, somewhat round, slowly 

 descending, each appearing to be a little immersed in the succeeding 

 whorl. Base convex, about as deep as the spire is high, umbilicus 

 moderate, partly concealed by the reflected columellar lip. Body 

 whorl large, with rounded periphery, its anterior upper edge slightly 

 descending at the aperture. Sculpture of numerous retractive growth 

 lines and microscopic reticulations ; sutures deeply impressed, crenu- 

 lated by the ends of the growth striae. Color rich, dark chestnut 

 fumed with darker color, especially along the suture. Base very 

 dark, nearly black, the colors of the spire and base separated by a 

 very distinct white line. Aperture nearly horizontal, widely rounded 

 with the lip moderately reflected. Interior livid purplish. Parietal 

 wall thinly glazed. 



The type (Cat. No. 333794, U.S.N.M.) measures: Greater diameter, 

 44 mm. ; lesser diameter, 36 mm. ; height, 28.5 mm. It and two para- 

 types come from Darnley Island, and were presented by Mr. C. 

 Walton. 



THERSITES (HADRA) BARTSCHI MOBIAGENSIS, new subspecies 



Plate 1, fig. 1 



Similar to Thersites hartscKi hartschi^ but thinner, slightly more 

 depressed and less highly colored. 



The type (Cat. No. 333797, U.S.N.M.) measures: Greater diameter, 

 44 mm. ; lesser diameter, 37.5 mm. ; height, 28.5 mm. It comes from 

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

 (Cat. No. 333798, U.S.N.M.) contains three specimens from the same 

 island sent by Mr. Walton. One of these is young, but when grown 

 apparently will be quite like the adult. The other two specimens 

 are very thin, more elevated, and have a tendency to globoseness. 

 One is nearly adult. Its sutures do not lie accurately along the 

 periphery of the preceding whorls. The other specimen is adult. 

 The suture of its whole body whorl and part of the penultimate 

 whorl fall below the periphery of the preceding whorl. This irregu- 

 larity of growth probably accounts for the departure from usual 

 form. 



THERSITES (HADRA) BARTSCHI YAMENSIS, new subspecies 



Plate 1, fig. 4 



Shell similar to Thersites 'bartscM hartscM but larger, more de- 

 pressed, whorls less rounded, growth riblets more marked, body 

 whorl angulated at the periphery (the angle more appreciable to 

 touch than to sight), base slightly less convex; aperture smaller, less 



