70 ACHAT1NA, EAST AFRICA. 



producing the woven appearance of a fabric; last whorl 

 elongate, narrow, gradually descending. Aperture pyriform, 

 bluish-white. Columella arcuate, thickened, not very ab- 

 ruptly truncated at the base, united to the lip by a thin 

 callosity. Length 75 millims., diam. 32; aperture 38 long, 

 21 wide" (Smith). 



Between Lake Nyassa and the east coast (Thomson) ; Luk- 

 wangulo Mt, 2,500 meters elev., central Uluguru (Nguru) 

 (Dr. Stuhlmann). 



A. thomsoni SM., Ann. and Mag. N. H., 1880, vi, p. 428; 

 P. Z. S., 1881, p. 283, pi. 33, f. 12. MARTENS, Beschalte 

 Weichthiere D. Ostafr., p. 92. 



"This species is remarkable for its narrow ovate form 

 and the peculiar woven appearance of its epidermis. The 

 proportion of the length of the aperture to that of the entire 

 shell varies; in some specimens it occupies rather more than 

 half the total length, and in others somewhat less. The 

 deep-brown stripes edged with brown, as a rule, occupy 

 more of the surface than the yellow spaces betiveen, and 

 although somewhat wavy (upon the last whorl especially), 

 do not take a large zigzag pattern. Most specimens are 

 more or less streaked with opaque golden lines in the direc- 

 tion of the lines of increment, which when falling upon the 

 dark stripes tell very vividly" (Smith). 



66. A. PASSARGEI v. Martens. 



Shell conoid-oblong, solid, regularly closely striatulate and 

 granulate; white, painted with pale brown, vertical, narrow 

 streaks. Spire conic, the apex acuminate, slender. Whorls 

 7%, rather convex, regularly increasing, the suture moder- 

 ately impressed and somewhat crenulate; the last whorl con- 

 vex below. Aperture subvertical, small, piriform-ovate, the 

 columellar margin vertical, rather thin, white, abruptly trun- 

 cate ; external margin lightly arcuate, basal margin narrowly 

 rounded. Length 61.5, diam. 30.5, aperture 29 x 17 mm. 



East Africa: Sodanna, in the northeastern angle of Ger- 

 man East Africa (0r. Passarge, 1898). 



