24 ACHATINA, WEST AFRICA. 



horizontally and shortly truncated above the base of the 

 rhombic-semioval aperture. Peristome simple, unexpanded, 

 the basal margin slightly arcuate. Length 46, diam. 23 mm., 

 aperture 25x12.5 mm. (Pfr.). 



West Africa (Cuming coll.). 



A. albicans PFR., P. Z. S., 1851, p. 259 ; Monogr., iii, p. 

 487; Conchyl. Cab., p. 320, pi. 26, f. 3. 



A small white species, not closely resembling any other 

 from West Africa, and known by the original specimen only. 



Group of A. pfeifferi (Section Pintoa Bgt). 

 Pintoa BGT., Moll, de 1'Afrique Equatoriale, p. 80, 1889. 



Slender, elongated shells, with the contour of Limicolaria. 

 Apex obtuse and rather large ; the nepionic whorls are smooth, 

 the following whorls decussate below sutures. Aperture 

 small. 



Bourguignat established this group for A. pfeifferi, semi- 

 decussata, capelloi, zebriola, polychroa, and colubrina. Re- 

 moving the second of these species, the remainder form a 

 moderately natural group, distinguished by their small size 

 and slender contour. The type of Pintoa is A. pfeifferi. 

 Perhaps A. ellioti Smith, an East African species, and A. 

 livingstonei M. & P., of Bechuanaland, belong here also. 



21. A. PFEIFFERI Dunker. PL 38, figs. 25-29. 



Shell ovate- turrite, rather solid, glossy; dirty white or 

 buff, ornamented with longitudinal brown flames and streaks, 

 covered with a yellowish cuticle. Spire long, the apex ob- 

 tuse. Whorls 8 to 9, a little convex, obsoletely longitudinally 

 striated, the upper ones very obsoletely decussate below the 

 suture, the last whorl nearly two-fifths the whole length of 

 the shell. Aperture oval; columella very arcuate; peristome 

 acute. Alt. nearly an inch and a half. Alt. : diam. as 

 100:35 (Dkr.). 



West Africa: Loanda, on sandy hills, not common (Dr. 

 Tarns). 



Achatina pfeifferi DKR., Zeitschr. f. Malak., 1845, p. 163; 

 Index molluscorum quae in itinere ad Guineam Inferiorem 



