PSEUDACHATINA. 215 



nut or purplish. Spire raised, the apex brown, obtuse ; whorls 

 8, convex, the last about two-fifths the total length, obsoletely 

 angular ; suture linear, broadly margined and plicate. Colu- 

 mella straightened, somewhat twisted inward, the base ob- 

 liquely, lightly truncate. Aperture lunar-oval; peristome 

 simple, acute, narrowly effusely spreading, bordered with pale 

 flesh color or whitish, the margins joined by a thin callous, 

 thickened outwardly at the base of the columella " (Shuttl.). 



West Africa: Gabun (Verreaux). 



Achatina downesii DESK, in Fer., Histoire, ii, p. 190, pL 

 122, f. 1-3. Pseudachatina gabonensis SHUTTL., Notitiae, i, 

 p. 86, pi. 8, f. 5, 6 (1856). PFR., Monogr., iv, p. 598. 

 KOBELT, Conchyl. Cab., p. 21, pi. 9, f. 1-6. 



Fig. 26, from Shuttle worth's original figure, excellently 

 represents the typical form of the species. The other figures, 

 copied from Kobelt, do not seem to me at all characteristic. 

 It is a light shell, often white throughout or with the early 

 whorls flesh tinted, but varying to forms with wide, indis- 

 tinctly bounded stripes on the spire, a purplish tip, and some- 

 times a brown base. Some patches of the dull blackish or 

 dirty yellowish cuticle adhere to most specimens. The spire 

 is often more slender than in any of the figures. Specimens 

 before me vary in length between 64 and 82 mm. 



12. P. MARTENSI d'Ailly. PL 6, figs. 30, 31, 32. 



Shell imperforate, ovate-oblong or turrite, solid, closely 

 and rather regularly plicate-striate. Under a scaly epidermis, 

 which is generally lost from the upper whorls, but frequently 

 persists on the last near the aperture, it is shining, whitish 

 or rose-fleshy, with darker apex, and very rarely ornamented 

 with a few short reddish evanescent streaks above the suture 

 of the median whorl; base blackish-chestnut. Spire convexly- 

 conic or turrite, the apex obtuse. Whorls lV 2j the first 4 a 

 little convex, smooth; following ones more or less flattened, 

 impressed below the narrowly margined suture, irregularly, 

 coarsely and distantly cristate-plicate or more rarely rather 

 regularly set with distant conic tubercles above the suture. 

 Last whorl behind nearly half the length of the shell, more 



