26 ORCULA. 



surface is dull, light brown or sometimes whitish. The epi- 

 dermal riblets are very delicate, irregularly developed in 

 some specimens, nearly regular in others. Specimens seen 

 vary in form from cylindric to wider above, and in size from 

 length 5.5, diam. 2.3 mm., of Sy 2 whorls, to 4.7 x 2.2 mm., 

 barely 8 whorls. 



It seems to be generally spread in northeastern Abyssinia 

 and adjacent highlands. Blanford's Pupa no. 15 is a rather 

 narrow form of this species according to specimens seen, figs. 



7, 8. The original figure of imbricata are reproduced in fig. 9. 



8. Orcula bulgarica Hesse. 



Shell with closed umbilicus, cylindric, with conically taper- 

 ing spire, sculptured with close, oblique rib-striae which are 

 rather strongly developed on the upper whorls, while they 

 almost disappear on the last; dark horn-color, whitish near 

 the aperture. Nine to ten convex whorls, separated by a 

 rather deep whitish suture, the last rather strongly ascending 

 to the aperture. Aperture semiovate-rounded, the margins 

 widely separated, connected by a flat whitish callus; outer 

 margin arcuate, especially in its upper part; columella ver- 

 tical, somewhat rounded, smooth or with a weak angle, but 

 without folds. The dentition is restricted to a somewhat re- 

 ceding, pretty low and short parietal lamella ; it begins about 

 1 mm. from the margin of the callus, terminating steeply in 

 front, diminishing quite gradually behind, and does not pene 

 trate far inward. Peristome whitish, reflected, somewhat 

 thickened. Length 6.5, diam. 3 mm. ; height of the mouth 

 2.2 mm. (Hesse). 



Bulgaria: drift of Devna lake at Gebedsehe, near Varna 

 (Prof. Herm. Skorpil). 



Orcula bulgarica Hesse, Nachrichtsblatt d. malak. Ges., vol. 

 47, June 1915, p. 62. 



Orcula bulgarica recalls 0. dolium in size and habit, but in 

 place of the umbilicus it has only a closed crevice. It differs 

 from all species of the genus yet described by the low, rela- 

 tively short parietal lamella and the complete lack of colu- 

 mellar folds (Hesse). 



