150 MICROSTELE. 



and the lack of the two deeply-seated palatal folds. The diffi- 

 culty of a positive decision was enhanced by the paucity of 

 material only one example of each form and I would not 

 reproach anyone for taking the snail under consideration for 

 a local race of L. noltei (Bttg.). 



4. MICROSTELE NOLTEI (Bttg.). PI- 14, figs. 12 to 16. 



Shell small, punctate-rimate, cylindric-turrited, solid, cor- 

 neous-buff. Spire long, turrited ; apex very obtuse. Whorls 

 6, very slowly increasing, rather convex, separated by a deep 

 suture, lightly obliquely striatulate, the last scarcely larger 

 than the penult, % the length of the shell, angular at base, 

 towards the aperture ascending a little, whitish, the back 

 distinctly flattened and swollen around the rimation. Aper- 

 ture small, circular-oval, the base a little receding, 4-toothed. 

 Peristome acute, flatly and broadly expanded, white, the mar- 

 gins converging, joined by a callus which bears a tubercle at 

 the insertion of the right margin; right margin is angularly 

 curved above, the basal and left regularly arcuate. Teeth 4, 

 deeply placed, 1 pliciform parietal, 1 strong columellar, twin 

 palatals in the throat. Length 3.75, greatest diam. 1.5 mm. ; 

 aperture 1 mm. high and wide (Bttg.). 



Southwest Africa, British Bechuanaland : Ghous, in the 

 southern Kalahari (C. Nolte). 



Pupa (Microstele n. sect.) noltei BOETTGER, Bericht Senck- 

 enb. Nat. Ges., 1886, p. 25, pi. 2, f . 4a-c. MELVILL & PON- 

 SONBY, Ann. Mag. N. H. (8), i, 1908, p. 78, pi. 2, f. 14, 15 

 (copied from Boettger). Leucochiloides (Microstele) noltei 

 BTTG., Abh. Senck. Nat. Ges., xxxii, 1910, p. 445. CONNOLLY, 

 Ann. S. Afr. Mus., xi, 1912, p. 178. 



Two specimens from near Klip (Connolly coll.) are figured. 

 The larger (fig. 13) measures: length 4.5, diam. 1.5, length 

 aperture 1.2 mm., fully 7 whorls. It has only a weak trace 

 of the angular tubercle. The parietal lamella is deeply placed 

 and short. The twin palatal tubercles are connected basally, 

 and not visible in a direct front view. 



The smaller specimen (pi. 14, figs. 12, 16) measures: length 

 3.83, diam. 1.5, aperture 1.16 mm., 6^4 whorls. The spire is 



