104 HELIX-EUIIADRA. 



a narrow peripheral brown band. The body-whorl is stained with 

 brown outside the lip ; and this owing to the thinness of the shell, 

 produces a brownish labrum, which in some places, particularly at 

 the extreme edge and in the columellar region, is somewhat whitish. 

 It is rather widely expanded at the base and coluniella, and is a 

 trifle reflexed everywhere. The aperture is very transverse, in fact 

 almost horizontal ; it is of a livid white color within, exhibiting the 

 brown marking of the exterior. 



H. PLATYSOMA Pilsbry. PI. 41, figs. 16, 17, 18. 



Shell much depressed, discoidal, perspectively umbilicated, thin 

 but moderately strong, white (lacking epidermis). The surface has 

 strong oblique, rib-strire, which are rather unevenly developed, and 

 rather weaker below ; and very minute close spiral strise are visible 

 in the intervals between the grow r th striae, under a lens. The spire 

 is almost plane ; apex obtuse, the first whorl smooth, polished, con- 

 vex, the following whorls of the spire flat, acutely keeled at circum- 

 ference, the keel filling the suture ; there is a " margined " appear- 

 ance above the suture. Whorls 5 ; the last whorl is wide, becom- 

 ing more convex on its last half and deeply descending below the 

 periphery in front. The periphery is obtusely carinated. The 

 aperture is extremely oblique, oval-truncate ; white inside ; peristome 

 somewhat expanded, white, narrowly reflexed on the basal margin, 

 dilated at the insertion. Umbilicus deep, broad, perspective. 



Alt. 12, greater diam. 31, lesser 27 mill.; width of umbilicus 6 

 mill. 



Habitat unknown. 



This is a shell of anomalous characters, but apparently allied to 

 the Liu-kiu Island and Japanese group of Camcena. The whorls of 

 the spire are flat, showing that the young are acutely keeled at periph- 

 ery. The spiral microscopic lines are about as fine and near together 

 as in peliomphala. The umbilicus is broad ; the lip slightly ex- 

 panded above, reflexed below. 



H. MIRANDA A. Adams. Unfigured. 



Shell depressed-globose, broadly perforate, spire turbinate, rather 

 elevated, apex obtuse; whorls 6, convex, with conspicuous oblique 

 streaks and close decussating revolving stride ; last whorl rounded at 

 the periphery, convex on the base; aperture oblique, lunate; per- 



