COLUMELLA, STERKIA. 109 



COLUMELLA (Vol. 27, p. 232). 



Columella edentula (Drap.). Vol. 27, p. 236. 



Vertigo cylindrica Colbeau (Vol. 25, p. 214) is considered 

 by Major Paul Dupuis to be an abnormal form of Columella 

 edentula (Ann. Soc. Roy. Zool. de Belg. LV, 1924, pp. 50, 51, 

 fig. L 1925). 



Columella pygmaeorum Pils. & Ckll. PI. 22, fig. 1. 



The minute shell is sinistral, deeply rimate, subcylindric, 

 the upper third distinctly tapering to the obtuse apex, of a 

 pale, light brown tint ; the surface dull, without evident sculp- 

 ture under a lens. Outlines of the spire are somewhat convex. 

 Whorls strongly convex and very gradually enlarging, the last 

 ascending slightly to the aperture. The aperture is longer 

 than wide, toothless. Peristome thin, the outer margin not 

 expanded, arching forward slightly; columellar lip somewhat 

 dilated. The umbilical chink is deep and rather long, with 

 deep axial pit, but we believe no actual perforation beyond 

 the last whorl. 



Length 2.4 mm., diam. 1.1 mm., aperture 0.75 x 0.6 mm. ; 

 81/4 whorls. 



Belgian Congo at Tshibinda, west of Lake Kivu, at about 

 6000 ft. Type 159672 A. N. S. P., paratype in Brit. Mus. 

 (Cockerell-Mackie-Ogilvie Exped.) 



Columella pygmaeorum Pilsbry and Cockerell, Proc. Zool. 

 Soc, London, 1933, p. 374, pi. 2, fig. 3. 



This species has the essential shell-structure of Columella, 

 but is peculiar in its narrow form, long taper and sinistral 

 coil, as well as by its diminutive size. It is the first Ethiopian 

 species of the genus. 



STERKIA (Vol. 26, p. 49). 



The species were numbered incorrectly in the key on pages 

 50, 51. Probably S. rhoadsi and S. antillensis would be better 

 treated as subspecies of 8. eyriesi. 



