212 PSEUDACHATINA. 



soni), but at the other end of the series of forms it is strongly 

 angular, as in the shell figured (f. 11). The base in all the 

 specimens has a dark fleshy-brown zone, more or less sharply 

 defined at its upper edge, which is not visible above the 

 suture. The sculpture is composed of coarse ribs, here and 

 there broken into tubercles, and chalky white at the summits. 

 W. Africa: Kamerun, at Bomana (Dusen), Itoki, Bonge, 

 Bibundi (Sjostedt), and Isowi (Jungner). 



7. P. GEAVENREUTHI ' Bttg. ' Kobelt. PI. 5, figs. 20, 21, 24, 25. 



Shell long ovate with turrite spire, rather solid but not 

 especially thick, the middle whorls sculptured with a few 

 short ribs and tubercles, elsewhere only finely and obliquely 

 striate, part of the strias rib-like below the suture. The color 

 is yellowish horn-color. Markings generally restricted to the 

 third and fourth whorls, consisting of oblique stripes, forked 

 above. Lower half of the last whorl only slightly darker, 

 often marked with small light flecks. The fibrous brown 

 epidermis is mostly well preserved on the last 2 whorls. 

 There are also specimens with handsomer coloring than the 

 above. Whorls 9, the initial 2 convex, with the usual sculp- 

 ture, next 2 also rather convex, and beautifully marked with 

 brown stripes, sometimes bordered with yellow or white; re- 

 maining whorls flattened, parted by an impressed, yellow- 

 white bordered, irregularly crenulate suture, and with a row 

 of tubercles or a tuberculose keel also above the suture. 

 Aperture oblique, ovate, acute above, bluish within, with a 

 liver-brown border. The columella is twisted, strongly ex- 

 cavated, shortly and obliquely truncate below. Outer lip 

 simple, expanded, or at most very shortly reflexed. The 

 margins are connected by a quite thin bluish or brownish 

 callous. Length 70 to 80 mm. 



Kamerun: Buea, at 950 meters elev. (Preuss, Dusen; type 

 loc.) ; Etome (Dusen). 



P. gravenreuthi Boettger, KOBELT, Conchyl. Cab., p. 18, 

 pi. 6, f. 3, 4; pi. 7, f. 1-4 (1891), with var. preussi KOB., p. 

 21, pi. 6, f. 5, 6; pi. 7, f. 5, 6. D'AILLY, Bihang, p. 94. 



A species of the downesii group, distinguished from gabo- 



