A NEW SUCCINEA* 



B. SHIMEK 



SucciNEA wiTTERi, h. s. — Plate I, figures I-V. 



Shell: Ovate-conic, ratlier heavy for a species of this genus; 

 whorls 3I/2, somewhat rounded, but more or less flattened below 

 the suture, forming a slight shoulder, or even constricted by a 

 shallow spiral groove which leaves the shoulder a low ridge fol- 

 lowing the suture, this being most prominent on the body- whorl ; 

 the spire is elevated, and on account of the flattening of the 

 whorls, quite regularly conical, forming a third or more of the 

 length of the shell ; body- whorl relatively large, but not greatly 

 expanded, its upper contour being distinctly flattened; aperture 

 ovate, broadly rounded below^, acute above, its columellar margin 

 somewhat incurved by an indistinct columellar fold; the peris- 

 tome sharp, very oblique to the axis of the shell in side view, and 

 in this view usually slightly sigmoid ; the surface is covered with 

 distinct lines of growth which are more or less unequal, and 

 crossed by irregular, unequal and interrupted spiral grooves 

 which are especially prominent on the body-whorl ; the color is a 

 distinct yellow, deeper at the apex, sometimes approaching 

 orange ; the dimensions of the 18 shells, figured in the same order 

 on the plate, are as follows (in millimeters) : 



Length, 17.0 17.0 16.5 16.5 16.0 16.0 17.5 17.0 17.0 



Width, 10.0 9.0 10.0 9.0 9.0 9.5 10.0 9.5 9.5 



Aperture, length, 11.5 10.5 11.0 10.0 10.5 11.0 11.5 11.5 11.0 



Aperture, width, 6.5 6.0 6.5 6.5 6.5 6.5 6.5 6.5 6.5 



Length, 17.0 16.5 17.0 16.5 16.0 16.0 16.0 16.0 15.0 



Width, 9.5 9.0 9.0 9.0 10.0 8.5 8.5 9.0 8.0 



Aperture, length, 11.0 11.5 11.0 11.5 11.0 11.0 11.0 11.0 10.0 



Aperture, width, 6.0 6.5 6.5 6.5 6.0 6.5 5.5 6.0 5.0 



Jaw: Strongly arcuate, the ends rounded and enlarged, the 

 convex margin somewhat wavy, the concave margin with a single 

 blunt central projection. (See fig. IV.) 



*Preprints of this paper were distributed March 6, 1913. 



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