10 AMl'HIDROMUS, S.-(J. PSEUDOPAHTULA. 



milky-subtranslucent, the surface with fine spiral and growth striae, 

 apex smooth and obtuse; aperture extremely oblique, with well 

 reflexed peristome. Mantle green ; the soft anatomy otherwise un- 

 known. Type Bidimus galericulum Mouss. 



Distribution: Java, Sumatra and Borneo. Arboreal. 



A small group of tree snails, by their form recalling Papuina or 

 Draparnandia, but in texture similar to Beddomea. As in the latter 

 group, the mantle shows green through the shell, evidently a protec- 

 tive coloration. The species composing the group were first associ- 

 ated by the writer in 18'JT. Prof, von Martens, as early as 1860, 

 grouped the Javan B. galericulum with the Ceylonese forms now 

 referred to Beddomea. There is evidently a close relationship be- 

 tween Pseudopartula and Beddomea; the former being distinguished 

 mainly by its non-punctate surface, more oblique aperture, and geo- 

 graphic distribution. 



The name of the group, ' false Fartula,' was probably suggested by 

 Mousson's comparison of A. galericulum with that genus. 



The sinistral coil of the whorls, though mentioned in the diagnosis 

 of the subgenus, is probably of minor significance. Calycia everetti 

 of Celebes seems to me to belong to this group rather than to Calycia. 



Key to Species of Pseudopartula. 



1. Shell acutely carinate, the outer angle of the aperture project- 

 ing in a " spout." 



a. Heliciform, the diameter exceeding the alt. Borneo. 



A. nustttus. 



b. Trochoidal, the diameter less than the alt. Sumatra. 



A. dohertyi. 



2. Shell Bulimoid, the aperture rounded outwardly. Java. 



A. galericuhun. 



A. GALERICULUIU (Mousson). PI. '2, figs. 31, 32, 33. 



Shell sinistral, imperforate, ovate-conic, subangulose, thin, subdi- 

 aphanous, slightly glossy, delicately striated transversely and spirally. 

 Spire conic, the suture linear, summit ornamented with a black dot, 

 whorls 6, rather flat, the last two-fifths the length, inflated at the 

 colurnella; the keel becoming obsolete upon it. Aperture very 

 oblique, obliquely ovale at a tangent to the base ; columella short, 

 obliquely incurved ; peristome widely and flatly expanded, milk-white, 



