34 ORCULA. 



on the axis (seen by breaking into the whorl just above the 

 aperture) are important features. Moreover, the shell is 

 larger and the lip much less reflected than in batumensis. 



0. moussoni is described as possessing a lower-palatal fold 

 similar to that of palatalis but shorter, and the shell has a 

 more robust figure. 



12c. Orcula scyphus crassa n. n. 



Differs from the type [of doliolum] by the thicker shell, 

 the aperture contracted by a robust lip, peristome strongly 

 dilated. Length 7, diam. 3 mm., 8-9 whorls. Balien-Keuy, 

 on the upper Euphrates [Pupa (Orcula) doliolum var. incras- 

 sata Naegele, Nachbl. d. m. Ges., vol. 38, 1906, p. 28, not 

 Pupa incrassata Sowb.]. 



Without knowledge of the form of the lamellae within the 

 last whorl, and the presence or absence of an internal palatal 

 fold, it is quite impossible to tell the rank or position of this 

 form, which appears to differ from mesopotamica by the 

 thicker shell and lip. 



12d. Orcula scyphus batumensis (Ret.). PI. 3, figs. 7-10. 



Very conspicuously different from the parent form [dolio- 

 lum] by the strong cervical ring and extraordinary develop- 

 ment of the callus. I collected this new variety in the debris 

 of the Tschorok at Batum (Caucasus). They belong to two 

 forms, one having 9-10 whorls with weakly raised riblets and 

 two distinctly visible columellar lamellae in the aperture; 

 length 6.5 to 8.9 mm., diam. 2.5 to 3 mm. The second form 

 is narrower, has 9-10 nearly smooth whorls, and the two 

 columellar lamella? recede so far that they are hardly visible 

 in the mouth. Length 5.25 to 7, diam. 1.9 to 2 mm. Such 

 slender examples of doliolum as the second form are hitherto 

 scarcely known. A separation of the two forms seems to me 

 impossible, as transitions occur which could be referred to 

 one as well as the other (Ret.). 



Pupa (Orcula) doliolum var. batumensis Retowski, Be- 

 richt Senckenb. Ges., 1888-9, p. 254. — Sturany, Ann. k. k. 

 Naturhist. Hofmus., Wien, xx, p. 304, fig. 7. 



