ACHATINA, WEST AFRICA. 27 



fifths the whole length, usually obliquely striped with 

 descending stripes. Columella somewhat twisted, straight, 

 abruptly truncate, nearly reaching the base. Aperture 

 truncate-oval, somewhat channelled, glossy-calloused inside. 

 Length 44, diam. 18 mm.; aperture 20x10 mm. (Morel.}. 



West Africa : Angola, in the district of Pungo-Andongo, 

 especially near the salines of Dungo. Malange (Buchner). 



Achatina polychroa MOREL., Journ. de Conchy]., xiv, 1866, 

 p. 158; Voy. Welwitsch, p. 72, pi. 3, f. 5. PFR., Monogr., 

 vi, p. 219. MARTENS, Jahrb., ix, 246. 



Excessively variable in size, color and pattern. Besides 

 the striped forms there are livid whitish shells, uniform or 

 with indistinct brownish streaks, and thin, uniform greenish- 

 brown ones. 



In the district of Ambaca, and that of the Due de Bra- 

 ganza, farther north, there is a larger form, 57 x 25 mm., 

 with the shell reddish or greenish-brown, in rare specimens 

 with dark flames as in the type. 



Ancey has referred this species to Leptocala (Bull. Soc. 

 Malac. France, v, p. 71, foot-note 5. 



24. A. COLUBRINA Morelet. PL 4, figs. 24, 25. 



Shell ovate-turrite, subfusiform, rather thin, glossy, lon- 

 gitudinally plicatulate-striate ; sooty, darker below, orna- 

 mented with wavy or angular blackish stripes. Spire turrite, 

 the apex subacute; suture crenulate, pale-margined. Whorls 

 7i/o, moderately convex, the early ones more or less granu- 

 late, the last tapering downwards, three-sevenths the total 

 length. Columella nearly straight, violaceous-brown, reach- 

 ing nearly to the base. Aperture oblong semioval, purple- 

 black and pearly within. Peristome thin and unexpanded. 

 Length 55, diam. 20 mm. ; aperture 23 mm. long, 10 wide 

 (Morel.). 



West Africa: district of Ambaca, near the cavern Purica- 

 carambola (Dr. Welwitsch). Malange (Mechow). 



Achatina colubrina MOREL., J. de Conchyl., xiv, 1866, p. 

 157; Voy. Welwitsch, p. 70, pi. 4, f. 1. PFR., Monogr., vi, 

 p. 219. MARTENS, Jahrb. D. Mai. Ges., ix, 246. 



