AET. 15 NEW AUSTRALIAN LAND SHELLS MARSHALL 



lisardensis swna, new. 

 Uzardensis rada, new. 

 iartschi hartscM, new. 



'bartsch 



■ modiagensis, new. 



l)artsch 



/ yamensis, new. 



tartschi 



oma, new. 



Ijartscht 



mura, new. 



'bartschx 



nesia, new 



iartscM 



paulensis, new. 



l)artscht 



murrayensis, new. 



iartscht 



fcbma, new. 



tartscJii 



elfa, new. 



dartschi 



(i/i;tt, new. 



tartschi 



cepa, new. 



waltoni, 



new. 



dalU, m 



3W. 



forsiterk 



ina forsterimia Pfeiffer 



forsteric 



ma major Pfeiffer. 



forsteric 



ma ada, new. 



darwini 



Brazier, 



At the present time this arrangement makes possible a satisfac- 

 tory classification of all the material of this group in the collection 

 of the United States National Museum. We believe, however, that 

 when specimens from others of the multitude of islands in Torres 

 Strait are collected, that the list of subspecies will have to be ma- 

 terially enlarged. 



THERSITES (HADRA) BIPARTITA BIPARTITA Fenissac 



Plate 1, fig. 3 



Helix Mpartita Ferussac, Histoire Naturelle des Mollusques, vol. 1, p. 176, 

 pi. 75a, fig. 1. 



Shell large, globosely turbinate, thick. Whorls slightly more than 

 seven, slightly rounded and convex, each appearing to be a little 

 sunken into the succeeding one, giving a somewhat beehive appear- 

 ance to the spire. Sculpture of many retractive growth riblets which 

 are strongest on the body whorl. Upper whorls with microscopic 

 reticulations, which on the body whorl become minute pittings. Base 

 very convex, widely umbilicated, the face of the umbilicus somewhat 

 flattened. Aperture oblique, whitish but indistinctly showing the 

 bipartite coloring of the exterior. Peristome white, reflected, par- 

 tially concealing the umbilicus. Parietal wall with a rather thick 

 callus which extends as a glaze some distance within the shell. 

 Periphery rounded, showing no sign of an angle. Suture well im- 

 pressed, irregularly crenulated by the upper ends of the growth 

 riblets. Body whorl slowly descending about 7 mm. as it approaches 

 the aperture. Color very conspicuously bipartite, the spire pale 

 straw color, the base chocolate, a white spiral line dividing the colors 

 of the spire and base. 



