104 ARCHACHATINA. 



obsolete. The mouth is oblong, within bluish, outer lip thin, 

 rounded, columellar margin sinuous, markedly truncate to- 

 wards the base." (M. & P.). 



35. C. LIVINGSTONEI (Melvill & Ponsonby). PL 14, fig. 1. 



Shell narrow, fusiform, thin, straw-colored, smooth, the 

 apex obtuse. Whorls 7, a little impressed at the suture, 

 somewhat ventricose, the last whorl longer than the rest, 

 decorated with longitudinal chestnut zebrine flames, the 

 flames straight in places, others branching or divaricating. 

 Aperture ovate, the margin of the outer lip thin, columella 

 truncate towards the base. Length 41, diam. 20 mm. 

 (M. &P.}. 



South Africa: Kuruman, Bechuanaland (David Living- 

 stone in coll. E. L. Layard). 



A. livingstonei M. & P., Ann. and Mag. N. H. (6), xix, p. 

 636, pi. 17, f. 6 (June, 1897). 



Seems to be allied to A. pfeifferi Dkr. and A. polychroa 

 Morlt., and may prove to belong to Achatina. 



Genus ARCHACHATINA (Alb.) Pilsbry, 1904. 



Archachatina ALBERS, Die Heliceen, p. 189 (1850), in part. 

 HERRMANNSEN, Ind. Gen. Malacozoorum, Suppl., p. 11 

 (1852), type A. sinistrorsa. Achatina sp. of authors. 



The shell is ovate, of moderate or large size, with very 

 obtuse, rounded summit, the protoconch being relatively very 

 large and widening rapidly, the first whorl flat above, nearly 

 smooth, the rest decussate-granulose ; this sculpture usually 

 diminishes in strength on the post-nepionic whorls. Whorls 

 5 to 7. Columella and aperture as in Achatina, or with the 

 outer lip expanded. Oviparous, the egg-capsules very large, 

 three to six contained in the uterus at one time. 



Type A. bicarinata (Brug.). 



Distribution, lands adjacent to the Gulf of Guinea, especi- 

 ally its north shore. 



This genus differs from Achatina in the obtuse summit of 

 the shell, caused by the great size of the protoconch, de- 



