ACHATINA, EAST AFRICA. 63 



uate above ; whorls 7, a little convex, the suture of the upper 

 ones simple, in the last whorl granulose by the decussation 

 of wrinkles by impressed lines. Columella deeply twisted, 

 abruptly truncate below, bluish-white. Aperture slightly 

 oblique, oval, lilac within; peristome simple, acute, the basal 

 margin arcuate. Length 95, diam. 53, aperture 54 x 30 mm. 

 (Mart.). 



A. glutinosa var. petersi is almost exactly like some 

 forms of Burtoa nilotica (Vol. XVI, p. 300) in color, sculp- 

 ture and texture, but the spire is more conic and more slen- 

 der above, and the columella differs. It is possible, however, 

 that Burtoa arose from the same Achatinoid stock as A. 

 glutinosa. 



55. A. PINTOI (Bourguignat). PL 41, fig. 8. 



Shell ovoid-ovate, ventricose, fragile, pellucid, striatulate 

 except the upper whorls, the last elegantly decussate with 

 spiral lines; uniform pale chestnut, obscurely ornamented 

 with darker interrupted or somewhat fulgurate flammules, 

 whitish towards the summit. Spire rather short, obtusely 

 acuminate. Whorls 6, convex, regularly increasing to the 

 last, separated by a relatively deep suture, the last whorl 

 large, much more than half the length, ventricose, slowly 

 descending at the insertion. Aperture slightly oblique, ob- 

 long-ovate, angular above, well rounded below. Peristome 

 unexpanded, acute; columellar margin somewhat curved, 

 rather short, not reaching to the base and abruptly trun- 

 cated, parietal callous very thin. Length 49, diam. 33, aper- 

 ture 32x19 mm. (Bgt.). 



Environs of Ugerengere, valley of the Kyngani on the 

 Ukani. 



Serp&a pintoi BGT., Moll, de 1'Afrique equatoriale, p. 86, 

 pi. 4, f. 4. 



56. A. FRAGILIS E. A. Smith. PL 9, figs. 25, 26. 



Shell ovate, acuminate above, very thin, subpellucid, yel- 

 lowish-olivaceous, unicolored or streaked with reddish. Spire 

 short, conic, rather obtuse at the apex. Whorls 6 to 7, 



