172 DISTRIBUTION OF PUPILLIDAE. 



Columella ninagongonis, new species. PI. 25, fig. 1. 



The thin shell is deeply rimate, cylindric in the lower half, 

 slowly tapering in the upper, to the very obtuse apex, the 

 lateral outlines being convex; light isabella color, fading to 

 pale gray on the first two whorls. The whorls are short and 

 strongly convex, the suture rather deeply impressed. Sculp- 

 ture of weak lines of growth, the first two whorls microscopi- 

 cally punctate. The aperture is short, a little longer than 

 wide. Peristome whitish, the outer margin rather strongly 

 curved and thin posteriorly, anteriorly becoming well ex- 

 panded, together with the basal and columellar margins. 

 Length 1.9 mm., diam. 0.8 mm., length aperture 0.5 mm. j 

 7 whorls. 



Belgian Congo: Mt. Ninagongo (north of Lake Kivu), in 

 moss of mountain forest at 9000 ft. Type 77268 M. C. Z., 

 coll. by Dr. J. Bequaert, Harvard African Exped. 1926-7; 

 paratype A. N. S. P. 



The only nearly related species known is C. pygmaeorum 

 Pils. & Ckll. (see p. 109), which is sinistral, a little larger and 

 with the outer lip less arcuate above. 



The following names were listed in Servain, Oeuvres Scien- 

 tifiques de M. J. R. Bourguignat, 1891 (not seen by H. P.). 

 The list has been reproduced by M. Connolly, 1934, Proc. 

 Malac. Soc. London, vol. 21, p. 72. All appear to be nude 

 names. 



Sphyradium adamii Bgt. Italy. 

 Orcula desertorum Bgt. Syria. 



hellenica Bgt. Greece. 



helvetica Bgt. Switzerland. 



mabilleana Bgt. Greece. 



pyrgula Bgt. Syria. 



rapula Bgt. Syria. 



scytoidea Bgt. Anatolia. 



Orcula helvetica Bgt. is listed by Connolly as described by 

 Westerlund, Fauna Europaea, p. 198. The form described 

 in that place is [Pupa alpestris] "var. helvetica mh.", not the 

 Orcula of Bourguignat. Westerlund did not ascribe it to 



