26 ACHATINA, WEST AFRICA. 



that on the back of the last whorl there appear to be whitish 

 lines so disposed on an almost black- chestnut ground as to 

 produce an elegant and characteristic delta design. The 

 aperture is ovoid, bluish-white, glossy inside and showing 

 the external pattern through. Right margin simple and 

 sharp; columella very strongly arcuate; on the parietal wall 

 a mere trace of callous. Length 33, diam. 12.5, aperture 

 13x7 mm. (Furtado, Journ. de Conchyl., 1886, p. 145, pi. 

 6, f. 2). 



22. A. ZEBRIOLATA Morelet. PL 6, figs. 13, 14. 



Shell ovate or elongate, obsoletely and irregularly striate, 

 a little glossy, whitish-fulvous or gray, painted with scarlet, 

 sinuous, longitudinal or oblique stripes. Spire elongate, the 

 apex rather obtuse, the suture impressed, in the last two 

 whorls generally margined. Whorls 8 to S 1 /^, a little convex, 

 the last three-sevenths the total length. Columella arcuate, 

 slightly truncate, nearly reaching the base. Aperture ellip- 

 tical, milk-white within, showing the bands through; peri- 

 stome acute and unexpanded. Length 35, diam. 15, aperture 

 141/2 x 91/2 mm. (Morel.'). 



West Africa: Golungo-Alto, on aquatic plants on the Rio 

 Quiapose, not far from Sange, Angola (Dr. Welwitsch). 

 Malange on the Quanza (Mechow) ; Malash on the Kassai 

 (Buchner). 



Achatina zebriolata MOREL., Journ. de Conchyl., xiv, 1866, 

 p. 158; Voy. Welwitsch, p. 72, pi. 3, f. 1. PFR., Monogr., 

 vi, p. 219. v. MART., Jahrb. d. D. Malak. Ges., ix, 246. 



23. A. POLYCHROA Morelet. PL 5, figs. 2, 3, 4, 5. 



Shell oblong-conic or fusiform, rather solid, plicatulate- 

 striate, and somewhat decussated in places by lightly- 

 impressed spiral lines. Whitish or fulvous, variously 

 painted with wide chestnut flame-like or zigzag stripes, 

 confluent at the base, and spots of the same color. 

 Spire long, the apex rather acute; suture submargined. 

 Whorls 9, a little convex, arcuately plicatulate-ribbed be- 

 low the sutures, the last whorl a little more than two- 



