ORCULA. 27 



One fresh and two bleached specimens found. The lamellae 

 must resemble those of 0. dolkim plagiostoma rather closely, 

 but the closed umbilicus and reflected lip are characters of 

 the doliolum group. It has not been figured. 



9. Orcula hesopotamica (Mouss.). PL 2, figs. 12, 13. 



Shell shortly rimate, cylindric, rather solid, obliquely 

 lightly striatulate, glossy, pale or corneous. Spire closely 

 coiled, terminating in a short, obtuse cone, the summit rather 

 obtuse, not projecting. Suture more impressed on the cone, 

 less afterwards. Nine whorls, the first ones rather convex, 

 with strong, membranous striae, the following whorls slowly 

 increasing, flattened, smooth; last whorl diminishing a little, 

 ascending, forming one-third the length, rounded at base. 

 Aperture subvertical, with a single compressed parietal la- 

 mella, not produced, and two short columellar lamella?. Peri- 

 stome expanded, somewhat reflected, rather obtuse, white- 

 lipped within, the margins remote, joined by a callous layer 

 thickened at the insertion ; right margin regularly curved, 

 not thickened in the middle nor impressed outside ; columellar 

 rather straight, spreading. Length 7-8, diam. 3 mm. (Mous- 

 son). 



Upper Mesopotamia, from the plain of Haleb to Biredschek 

 (Biredjik; here selected as type locality) and Siverek (Su- 

 verek), Dr. A. Schlaefli. 



Pupa (Sphyradium) scyphus Friv. var. me sopot arnica 

 Mousson, Journ. de Conchyl., xxii, 1874, p. 31. 



The figures were drawn from a Biredjik specimen from 

 Mousson. It is quite thin, very light brown, obliquely striate, 

 the striae closer on the cone, where the whorls are quite con- 

 vex. Later the whorls become only weakly convex, but the 

 suture is well impressed throughout. The apical cone is very 

 short. Last whorl ascends very little in front and is broadly 

 rounded at base. The white peristome is expanded and well 

 reflected, with some inner thickening. Parietal callus thin, 

 bearing a tubercle at the insertion of the outer lip. The 

 parietal lamella is well developed, not emerging to the edge 

 of the parietal callus, penetrating one whorl, very strong 



