LIMICOLARIA, EAST AFRICA. 285 



Knicomba plain, on the southwest shore of Tanganyika. 



L. mcgalcca BGT., Moll, de 1'Afric. Equat., pp. 102, 105, 

 pi. 6, f. 4 (1889). 



This remarkably lengthened species is narrower and more 

 regularly tapering than L. spekeana Grandid. 



55. L. COULBOISI Bourguignat. PI. 33, fig. 23. 



Shell' subrimate (the rima almost wholly closed), slender, 

 very much lengthened, somewhat cylindric, attenuate at the 

 obtuse summit, rather opaque and thick, glossy, striatulate; 

 whitish with continuous or interrupted chestnut flames. Spire 

 much produced, slender, tapering, much attenuated at the 

 summit, but nevertheless obtuse at the apex. Whorls 9, a 

 little convex, the first slowly, then rather rapidly increasing, 

 parted by an impressed suture; last whorl convex, elongate, 

 less than one-third the total length. Aperture oblique, ob- 

 long. Peristome unexpanded, acute. Columella reflexed, 

 slightly curved; the outer margin a little arched forward; 

 parietal callous diaphanous, though rather thick. Length 

 61, diam. 15.5, aperture 19 x 7 mm. (Bgt.) . 

 Kerasa, Usagara. 



L. coulboisi BGT., Moll, de 1'Afric. Equat., p. 106, pi. 6, 

 f. 1 (1889). 



More slender than L. megalaa, the only closely related 

 species. 

 56. L. DROMAUXI Bourguignat. PL 33, fig. 25. 



Shell with a puncture-like rimation,very much lengthened, 

 tapering-cylindric, rather thick, somewhat opaque, glossy, 

 uniform pale whitish-buff, smooth and polished, obsoletely 

 sublamellose below. Spire greatly produced, regularly acu- 

 minate, though slightly obtuse at the summit. Whorls 10, 

 convex, regularly and slowly increasing, parted by a deep 

 suture, the last whorl convex, slightly exceeding one-fourth 

 the total length. Aperture oblique, rather lunate, rounded- 

 ovate; peristome unexpanded, acute; columella reflexed, 

 nearly straight; the outer margin receding, arched forward a 

 little; parietal callous rather thick. Length 44, diam. 14, 

 aperture 13x7 mm. 



