120 COLUMNA. 



Olive-buff, ornamented with chestnut-brown longitudinal, 

 rarely zigzag streaks, sometimes broken into spots, wider be- 

 low the periphery of the last whorl, and generally confluent 

 at the base. Spire conic, the apex obtuse, pale rose; suture 

 obsoletely margined and subcrenulate. Whorls 6, the upper 

 ones but little convex, the last swollen, more than three-fifths 

 the total length. Colurnella narrow, above obsoletely twisted- 

 plicate, bluish below bordered by a white callous, obliquely and 

 shortly truncate, not reaching to the base of the aperture. 

 Aperture little oblique, oblong acuminate-oval, bluish-white 

 inside, with a pearly luster, showing the external stripes 

 through. Peristonie simple, acute, frequently a trifle ex- 

 panded, brown-edged within, the margins joined by a very 

 thin callous, the right margin arcuately produced below the 

 middle. Length 80 to 90, diam. 40 to 50; aperture, length 

 47 to 53, width below the middle 25 to 28 mm. (d'Ailly). 



West Africa: Etome, Kamerun, 230 meters elev. (Dusen). 



Achatina camerunensis D'AILLY, Mollusques terrestres et 

 d'eau douce de Kamerun, in Bihang till K. Sv. Vet. Akad. 

 Handl., xxii, p. 64, pi. 3, f. 1-4 (1896). 



The distinctive feature of this species is its granulation, 

 distinct even below the periphery. The flames frequently are 

 abruptly interrupted at the periphery, only some narrow 

 branches extending upwards. The suture is margined and 

 finely crenulate. 



Genus COLUMNA Perry, 1811. 



Columna PERRY, Conchology, pi. 51. 



The shell is imperf orate, oblong-tapering or pillar-shaped; 

 the protoconch is large, first whorl planorboid, nearly smooth, 

 those following descend rapidly, are flatly sloping and densely 

 granose-decussate. The subsequent (post-embryonic) whorls 

 are convex, either smooth or decussate, and are zigzag- 

 streaked. The outer lip is thin and simple, the columellar 

 axis is imperforate, slender, more or less spirally coiled in 

 the later whorls, and narrowly truncate at base. 



The back has throe keels, set with black tubercles. Pos- 



