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PROCEEDINGS OF THE NATIONAL MUSEUAI 



ing of two smooth, glossy whorls. The striation is not perceptibly 

 coarser on the last whorl. Aperture wide, nearly quadrangular; 

 sinulus scarcely perceptible, separated only by the superior lamella. 

 The peristome is continuous whitish, narrowly reflexed, hardly thick- 

 ened, the upper margin adnata or barely free from the preceding 

 whorl. 



Q- 



) 



Mg H7 Ms 



n, L6 L5 



Figure 51, — Zaptyx (Zaptyx) annae, new species: a, Ventral side of holotype (the vertical 

 line seen here and in the following figures represents the actual size of the holotype); 

 b, right side of a paratype (the ribs are omitted); c, clausilium (X 5); (f, radula (X 390). 



Superior lamella short, compressed, vertical, just reaching the mar- 

 gin, generally (83 out of 96 specimens) distant from the low spiral 

 lamella, which extends inward nearly to the middle of the ventral side. 



Inferior lamella visible in a frontal view as a low fold on the colu- 

 mella, reaching the margin in the right corner. It ascends vertically 

 inward halfway on the visible part of the columella, at the same time 

 increasing in height ; abruptly becoming low again at a lateral position 

 just before leaving the columella and continuing on the parietal wall, 

 then extending inward nearly as far as the spiral lamella. 



Subcolumellar lamella deeply immersed, its lower end not visible 

 within the aperture. 



