ACHATINA, WEST AFRICA. 21 



forests of the district of Huilla, not far from the colony of 

 Lopollo, Benguela (Welwitsch). Malange, on the Quanza 

 (Coanza) river (Buchner). 



Achatina bayaona MOREL., Journ. de Conchyl., 1866, p. 

 157. PFR., Monogr., vi, p. 214. A. bayoniana MOREL., Voy. 

 Welwitsch, p. 68, pi. 7, f. 1. PFR., Monogr., viii, p. 274. 

 MARTENS, Jahrb., ix, 245. 



Curious for its thin texture, brilliant gloss and ventricose 

 shape. There is a less ventricose form with longer spire of 

 nearly a whorl more, and much thinner yellowish-green shell. 

 Length 62, diam. 33 mm. 



16. A. TAVARESIANA Morelet. PL 2, figs. 13, 14. 



Shell ovate-subfusiform, thin, striate, glossy, buff-green, 

 irregularly streaked with darker. Spire long-conic, obscurely 

 flammulate, the apex a little obtuse. Whorls 8y 2 , granulated 

 as far as the periphery of the last one, the latter rather 

 ventricose, longer than the spire. Columella nearly straight, 

 obliquely truncate, pale. Aperture oblong, oval, opalescent- 

 bluish inside ; peristome unexpanded, thin. Length 67, diam. 

 31 mm. (Morel.). 



West Africa : presidio of Pungo-Andonga, Angola, in 

 great numbers, in the edge of the forest. 



Achatina tavaresiana MOREL., Journ. de Conchyl., 1866, 

 p. 157; Voy. Welwitsch, p. 69, pi. 5, f. 6. PFR., Monogr., 

 vi, p. 214. cf. SMITH, P. Z. S., 1893, p. 635. 



Group of A. liortensia: (Section Serpcea Bgt.). 

 Shell small, short, strongly inflated, quite thin. A. hor- 

 tensice may be taken as the type of a small group of species, 

 indicated by Bourguignat under the name Serpcea. He, 

 however, included Achatincc of very diverse structure. 



17. A. DAMMARENSIS Pfeiffcr. PL 11, figs. 32, 33. 



Shell ovate, thin; pale greenish-buff, marked with dark, 

 irregular streaks. Spire conic, the vertex minute, obtuse; 

 suture little impressed, minutely crenulate. Whorls 6^/2, a 

 little convex, the upper granulate-decussate, the penult, with 



