32 ACHATINA, WEST AFRICA. 



29a. Var. INFRAFUSCA v. Martens. PL 4, figs. 22, 23. 



Shell fusiform-ovate, imperforate, mgose-striate, granu- 

 lated throughout, the granules in spiral series. Tawny above, 

 the suture and periphery painted with more or less wavy 

 or short chestnut stripes, uniform chestnut below, some 

 darker spots in places where the two colors join. Spire conic, 

 the suture simple. Whorls 8%, nearly flat, the first two 

 white, the following with numerous stripes. Aperture occu- 

 pying somewhat less than half the length, ovate, but obliquely 

 contracted above and below, bluish inside. Peristome thin, 

 unexpanded, dark brown inside. Columellar margin some- 

 what arcuate, bluish, narrowed below and then transversely 

 truncated. Length 120, diam. 60, aperture 59 x 32 mm. 

 (Mart.). 



West Africa: mouth of the Gabun river (Dr. Buettner) . 



A. dimidiata v. M., Conchologische Mittheilungen, iii, p. 

 17, pi. 42, f. 1, not of Smith. A. infrafusca MARTENS, Besch- 

 alte Weichthiere D. Ostafr., p. 89, 1898. 



"Recalls A. balteata Rve. from Gambia in many respects, 

 but differs by the coloring, which resembles more that of 

 A. tincta Rve., which, however, has a different form and 

 sculpture" (Mart.). 



The shells from Gabun before me are partly typical infra- 

 fusca, partly intermediate between that and typical balteata* 



30. A. IOSTOMA Pfeiffer. PL 17, fig. 18; pi. 42, fig. 10. 



Shell fusiform-ovate, thin, evenly granulate throughout, 

 slightly shining; fulvous, ornamented with obscure, wide, 

 subangular streaks. Spire conic, attenuate above, pallid, the 

 apex obtuse; suture subcrenulate. Whorls 7!/2> & trifle con- 

 vex, the last a little longer than the spire, somewhat taper- 

 ing at the base. Columella slightly twisted, the base ob- 

 liquely and shortly truncate. Aperture vertical, narrowly 

 semioval, pale lilac and glossy within; peristome simple, the 

 right margin regularly arcuate. Length 128, diam. 56, aper- 

 ture 72x30 mm. (Pfr.). 



West Africa: Fernando Po (Fraser, in Cuming coll.); 

 Kamerun at Etome, Bibundi, Itoki Na N'Golo and Victoria 

 (Dusen, Sjostedt and Buchholz). 



