88 TRUNCATELLINA OF ABYSSINIA. 



Jickeli considers it doubtfully distinct from P. claustralis, 

 but the single specimen of schilleri is wider, not so evenly 

 cylindric, darker colored; the parietal lamella of claustralis 

 is shorter and terminates on a part of the parietal wall visible 

 in the aperture, while in the African snail it penetrates 

 deeper within. 



20. TRUNCATELLINA SIMILIS (Jickeli). PL 9, figs. 1 to 5. 



The minute shell is narrowly perforate, cylindric, brown, 

 with an oily luster, under the lens showing oblique, moder- 

 ately crowded longitudinal ribs. The 5% convex whorls in- 

 crease regularly and are separated by a rather deep suture, 

 the last whorl is contracted but little towards the base, and 

 rises slightly to the aperture. The aperture recedes towards 

 the base, is ovate and three-toothed. On the parietal wall 

 stands a strong, rather high fold, beginning rather deep 

 within, and running far inward. On the columella a blunt, 

 strong, tubercular tooth, entirely seen only by turning the 

 shell. On the palatal wall, at the same level with the colu- 

 mellar tooth, there is a tubercular tooth, only seen by turn- 

 ing the shell, as in a direct front view it is covered by the 

 visible part of the columellar tooth. Peristome is thickened, 

 slightly reflected, the margins but little converging. Length 

 1.75, diam. 1 mm., aperture alt. and width % mm. (Jickeli). 



Abyssinia : Habab country, at the descent of Nakfa, one 

 example (Jickeli). 



Pupa simiUs JICKELI, Nova Acta, vol. 37, 1875, p. 296, pi. 

 5, f. 16. 



Jickeli at first thought this a form of P. schilleri but later 

 distinguished it. The form of P. schilleri is more compact, 

 relatively wider; the last whorl contracts towards the base, 

 so that the outer margin of the peristome is not arcuate as in 

 similis, but rather straight. P. similis is, moreover, rather 

 less closely ribbed and the upper whorls not so smooth as in 

 schilleri. Finally, P. similis has a strong, high parietal la- 

 mella, P. schilleri a very low one, hardly noticeable ; the colu- 

 mellar tooth in similis is at least partly visible in a direct 

 front view, but not at all visible in P. schilleri. 



