PSEUDACHATINA. 213 



nensis by the more slender spire, less plump form and diverse 

 coloration. It is quite variable, as the figures show, but 

 seems, so far as I can judge from a few specimens, to be 

 fairly distinct. 



la. Yar. PREUSSI Kobelt. PL 5, figs. 22, 23. 



Conspicuously smaller, hardly exceeding 60 mm. long and 

 30 wide, with a whorl less than typical gravenreuthi. Taken 

 at the same localities as the latter. 



8. P. ELONGATA Pfeiffer. PI. 2, f. 1, 2, 3. 



Shell imperforate, oblong-turrite, solid, irregularly ob- 

 liquely plicate, and having a granulate girdle above the 

 suture ; reddish tawny. Spire turrite, the apex rather obtuse ; 

 suture white-margined, crenate. Whorls 7y 2 , the upper con- 

 vex, the rest nearly fiat, last whorl obtusely carinate in the 

 middle, more than one-third the length. Columella callous, 

 sub truncate-twisted. Aperture little oblique, oblong-oval; 

 peristome simple, the margins joined by a thick white cal- 

 lous, right margin narrowly expanded. Length 84, diam. 33 

 mm.; apert. 37 mm. long, 20 wide (Pfr.). 



West Africa: on the Gabun river (Cuming coll.). 



P. elongata PFR., P. Z. S., 1865, p. 832; Monogr., vi, p. 

 206. KOBELT, C. Cab., p. 17, pi. 6, f. 1, 2; pi. 12, f. 1. 



Comparatively smooth, like P. gravenreuthi. The figures 

 are from Kobelt, fig. 3 representing Pfeiffer's type in the 

 Cumingian (now B. M.) collection. 



9. P. PERELONGATA Rolle. 



Shell very long, turrite, solid, moderately plicate-striate, 

 decussated with evanescent spiral lines, covered with a rough, 

 deciduous, straw-colored cuticle. Whorls 9, a little convex, 

 separated by a distinctly margined and subcrenulate suture, 

 subangular below the suture ; last whorl impressed below the 

 suture, then somewhat angular at the periphery. Aperture 

 moderately oblique, oblong-oval, the peristome rather ex- 

 panded, white-lipped, more effuse basally. Columella rather 

 straight, moderately twisted, sub truncate at base, forming a 



