28 ORCULA. 



towards its inner termination. Columella with two lamella, 

 the lower strong, upper receding, very weak in front, inter- 

 rupted within. Internally (fig. 12) the columellar lamella 

 becomes very strong on the left side, where the supracolumel- 

 lar also is strengthened. There is no trace of an internal 

 lower-palatal fold. Length 7.5, diam. 3.2 mm., 9y 2 whorls. 



0. mesopotamica is thinner, not so broad as 0. orientalis, 

 and differs (from the form coerulescens, which alone I have 

 opened) in the shape of the inner end of the parietal lamella. 

 The two species appear to be quite distinct. It needs com- 

 parison with the typical form of 0. scyphus described by 

 Pfeiffer, but that appears to be a more elongate shell of more 

 whorls, the last one compressed basally, the outer lip thick- 

 ened within. 



10. Orcula sirianocoriensis (Mousson). PL 5, figs. 8. 



Shell larger [than 0. dolium], shortly rimate, regularly 

 cylindric, the summit very obtuse ; aperture a little inclined, 

 retracted, the margins subparallel (Mousson). 



Shell nearly cylindric, whitish-corneous, rimate, slightly 

 dilated above, the summit convexly conic, apex obtuse. 

 Whorls 10, very slowly increasing, scarcely convex, the upper 

 5 obliquely costellate, the narrow costellae narrower than the 

 interstices, lower whorls striatulate, the last narrowed basally, 

 hardly one-third of the total length, ascending a little in 

 front. Aperture truncate-oval. Parietal lamella high, the 

 columellar slightly visible in an oblique view (distinct in 

 young specimens). Peristome white-thickened, the margins 

 converging, hardly connected, the outer margin thin above, 

 then rapidly thickening. Parietal wall usually having a 

 tubercle at the insertion of the outer lip. Length 9, diam. 

 4.5 mm. (Kobelt). 



Cyprus; apparently rather generally distributed but no- 

 where abundant; type loc. in debris of the river of Siriano- 

 cori. 



Pupa dolium var. sirianocoriensis Mousson, Mittheil. Natur- 

 forsch. Ges. in Zurich, iii, no. 102, 1854, p. 386. — Pupa (Or- 

 cula) sirianocorensis Kobelt, Rossmaessler 's Iconographie 



