NEGULUS. 



103 



It is distinguished from P. abyssinica by the less cyliudric 

 shape, wider umbilicus, more convex and regularly increasing 

 whorls, of which the last scarcely (but in abyssinica strongly) 

 ascends in front. It differs further by the longitudinal rib- 

 bing, darker color, the silky luster and unarmed aperture. 

 From P. edentula it differs likewise by the longitudinal rib- 

 bing and silky gloss, also by the strong taper towards the base, 

 larger last whorl, and the impressed outer lip (JickeU). 



NEGULUS ABYSSINICUS (Eeinhardt). PI. 5, figs. 19, 20, 21. 



Shell small, perforate, cylindric-ovate, corneous, glossy, 

 striatulate; suture moderate; whorls 5y 2 , the first three 

 rapidly, the following but little increasing, last a little prom- 

 inent. Aperture higher than wide, toothless, rather oblique ; 

 peristome acute, slightly expanded, the columella thickened 

 towards the parietal wall. 



Length 2y 8 , diani. 1, apert. % x i/ 2 nun. (Reinh.) . 



Southern Abyssinia (Heuglin and Steudner). 



Pupa edentula var. minor MARTENS, Malak. Blatter, 1866, 

 p. 96. Pupa abyssinica REINHARDT in von Martens, Mollus- 

 ken, in v. d. Decken's Reisen in Ost-Afrika, iii, 1869, p. 151. 

 -JICKELI, Moll. N.-O.-Afrika's, 1874, p. 123, pi. 5, f. 13.- 

 Pupa abessynica Reinh., BOETTGER, Jahrb. Nassau. Vereins f. 

 Naturk. Jahrg. 42, 1889, p. 269. 



It differs from P. edentula by the more slender shape, nar- 

 rower umbilicus, blunted apex and relatively higher whorls; 

 further, the last whorl of abyssinica is higher, tapers more 

 towards the base, and ascends somewhat in front. The aper- 

 ture in abyssinica is higher than wide, the right margin 

 lightly impressed and the columella distinguished by a tooth- 

 like swelling at the insertion. In P. edentula the aperture is 

 as wide as high, the right margin beautifully arched, and the 

 columella shows only a hardly noticeable thickening at the 

 insertion (JickeU). 



NEGULUS KENIANUS (Preston). PL 5, fig. 14. 



"Shell minute, cylindrically ovate with very obtuse apex, 

 scarcely rimate, moderately thin, pale reddish-chestnut; 

 whorls 4, convex, shouldered above, marked with fine, oblique, 



