PSEUDACHATINA. 207 



2. P. NACHTIGALI Kobelt. PL 2, figs. 5, 6. 



Shell imperforate, ovate-turrite, solid, obliquely roughly 

 striate and costulate, here and there obsoletely spirally line- 

 ate; uniform yellowish white, only the embryonal whorl yel- 

 lowish, and the third and fourth whorls marked with pale 

 brown streaks. Whorls 8, separated by a rather irregular 

 suture ; first 2 bearing the usual crowded hair-scars, next 2 

 simply convex ; from the fourth on they are impressed below 

 the suture and sculptured with short riblets; further down 

 the impressed zone is bounded by a sharp line, and over the 

 suture a tuberculate girdle also appears, which continues at 

 the periphery of the last whorl and becomes evanescent near 

 the outer lip ; the last whorl being rendered indistinctly an- 

 gular thereby. Behind the lip and along the columellar cal- 

 lous it is colored yellowish, and shows some dark growth- 

 striae; anteriorly it descends slowly, and is somewhat com- 

 pressed around the umbilical region. Aperture only slightly 

 oblique, rounded-ovate, rather large, white. Columella arcu- 

 ate, strongly excised, much shorter than the mouth, scarcely 

 truncate below. The strong columellar plate is washed with 

 flesh color above, this color running inward band-like. Outer 

 lip beautifully rounded, broadly reflexed, thickened with 

 white within. Length 83, diam. 43, oblique length of apert. 

 38 mm. (Kob.). 



West Africa (type in Senckenberg Museum). 



Pseudackatina nachtigali KOB., Conchyl. Cab., p. 12, pi. 3, 

 f. 1, 2. 



Nearest to P. elongata Pfr., but with convex whorls and 

 broader lip. Description and figures from Kobelt. 



3. P. DOWNESII (' Gray ' Sowb.). PI. 8, fig. 48. 



Shell oblong-turrite, rather solid, whitish under a thin, 

 lamellose, yellowish cuticle, usually with the base and some 

 wide flames on the spire chestnut- colored, the early whorls 

 generally roseate. Surface more or less roughened by irreg- 

 ular oblique ridges, wrinkles and elongate warts. Whorls 

 8-9, rather flattened, the last more or less angular at the per- 

 iphery, the angle often subobsolete. Suture bordered by a 



