304 BURTOA. 



gular above, subeffuse at the base; peristome straight, acute; 

 columella nearly straight, dilated above the axial crevice, 

 acute at the base ; margins joined by a strong callous. Length 

 89, diam. 55, alt. of aperture 52, width 30 mm. ( Grandidier) . 



Eidges near the Victoria Nyanza, southeast, in the direc- 

 tion of Kilima-njaro. 



Limicolaria ~bourguignati GRANDIDIER, Moll. Cent. Afr., 

 Bull. Soc. Malac. France, ii, 1885, p. 157, pi. 7, f. 1. Not 

 L. bourguignati Paladilhe, 1872, a species of Opeas. Burtoa 

 lourguignati BGT., Moll. Afr. Equal, p. 91 (1889). 



Var. BRIDOUXIANA Bourguignat. PL 35, fig. 23. 



Shell with the perforation almost completely closed, ovoid- 

 elongate, thin, sub transparent, grooved except on the upper 

 whorls, the longitudinal striae cut on the upper part of the 

 last whorl by spiral lines. Coloration of long, narrow, longi- 

 tudinal flames of chestnut-yellow, alternating with others of 

 a blackish shade. Spire regular, obtusely acuminate, of 8 

 slightly convex whorls, slowly increasing to the last. Suture 

 not deep. Last whorl convex, oblong, not over two-thirds 

 the alt. Aperture vertical, excised, lengthened oblong, 

 strongly angular above, the outer margin regularly arcuate, 

 a little retracted below. Peristome unexpanded, acute, the 

 columellar margin straight, reflexed in a long triangular dila- 

 tation, the lower angle of which reaches to the base of the 

 axis. Length 79, diam. 44, aperture 44 by 25 mm. 



Usugara, at Mont Kidete, between Kondoa and Mpuapua. 



Burtoa ~bridouxiana BGT., Moll. Afr. Equat., p. 92, pi. 4, 

 f. 3 (1889). 



This is apparently a young shell. The following from the 

 same region is much younger and may be allied: 



Burtoa lavigeriana Bourguignat. (PL 30, fig. 19). 



Shell narrowly, very deeply perforate, small, relatively very 

 much swollen, very fragile, transparent, very finely striat- 

 ulate except on the embryonic whorls, decussate with fine 

 spiral lines on the upper part of the last two whorls. Cuticle 

 very fugacious, of a pale yellow with dark chestnut streaks 



