12 ORCULA. 



tion with dolium cannot be gauged. It is a problem for Ger- 

 man and Austrian conchologists who have long series of speci- 

 mens. 



Sandberger, while figuring and describing the loess form, 

 also referred to plagiostoma certain recent shells from some 

 places in the Alps of Austria, Bavaria, Lombardy, Switzer- 

 land and France (Grenoble). Part of these probably belong 

 to the var. uniplicata P. & M. ; others certainly to var. pfeifferi 

 Moq. This differs from plagiostoma by having the shape of 

 typical dolium, and by the much stronger development of 

 the lamella? within the last whorl. I do not think them con- 

 nected racially with the loess form. 



In the loess, plagiostoma occurs as a pure race in, as well 

 as northward beyond, territory where the typical dolium is 

 found living. It is less elongate than the recent var. unipli- 

 cata P. & M., though often longer than the loess specimen 

 figured. 



Orcida dolium var. implicata 'Brancsik' Clessin. PI. 1, fig. 

 5. Columellar folds indistinct, almost entirely wanting. Upper 

 Hungary in the Comitate Trencsin at Vratna. (Clessin, Die 

 Mollusken fauna Oesterreich-Ungarns u. der Schweiz, 1887, p. 

 234, fig. 136.) It may be surmised that this form is racially 

 identical with plagiostoma- Sandb., 1875. 



1/. Orcula doUum transversalis (West.). 



Shell umbilicate-perforate, obese, cylindric, the upper three 

 whorls forming an extremely short cone. Nine to ten very 

 slowly increasing, transverse, slightly convex whorls, separated 

 by an impressed suture, everywhere horizontal except at the 

 last whorl where it ascends; the last whorl short, dilated 

 above at the aperture, basally rounded. Aperture small, sub- 

 semioval, at base outwardly narrowed, columellar margin 

 somewhat straightened, vertical; lamellae as in dolium, all 

 marginal; peristome straight, acute, simple, connected by a 

 wide parietal callus. Length 6%, diam. 2y 2 mm. (West.). 



Greece: Tschumerka, Mt. Pindus (Th. Krueper). 



Pupa (Orcula) transversalis Westerlund, Nachrichtsbl. d. 

 malak. Ges., xxvi, Oct. 1894, p. 171. 



