156 TRITONIDEA UNDULATA. 



be , after the description , still more remote. The speci- 

 mens vary slightly in the thickness of the ridges, which 

 give the shell a more or less dark appearance. 



Canidia Helena Meder, 

 var. rotundicosta Schepman. 



Shell narrower than in the type , with the last whorl 

 smaller. Colour much darker, greenish olive brown, costae 

 more broadly rounded , with rather narrow intermediate 

 spaces. 



Hab. Java, collected by Groen (Leyden Museum). 



Typical specimens of this variety might be considered as a 

 new species, but the character of the costae is rather 

 variable , so as to pass into the typical form , with nar- 

 row flattened ribs. The specimens vary in form , some 

 of them being extremely narrow , such specimens may be 

 named : forma angustior. They are all darker in colour 

 than the type, which is more decidedly greenish. 



A^assa javana, n. sp. 



(Plate 9, fig. 2). 



Shell acuminately ovate, whitish, marbled with red- 

 brown markings, showing a tendency to form a band near 

 the middle of the last whorl and a second one towards 

 the base, where the brown colour becomes more confluent, 

 and with an articulated band of blue brown blotches near 

 the sutures. Whorls 10, spire acuminate, 3 apical whorls 

 smooth, the 5 subsequent ones rather flat, crossed by 

 numerous ribs and spiral striae; penultimate and ultimate 

 whorls rather inflated , nearly smooth , with only 2 or 3 

 striae near the suture and 8 near the base; sutures distinct, 

 irregular ; aperture oval , white , columella callous, with two 

 plicae near the upper angle of the aperture, and termina- 

 ting with a sharp curved spine, with a few plicae or 

 granules above it. Outer lip with a thick varix externally 

 and a few folds behind it; edge sharp, with 7 denticles 



Notes from the Leyden M^useum, Vol. XIII. 



