238 PSEUDOTROCHUS. 



West Africa : Cape Palmas. Type in coll. A. N. S. P. 



Perideris kobelti PILSBRY, Proc. A. N. S. Phila., 1897, p. 

 503 (1898). Bidimus torridiis REEVE, Conch. Icon., v, pi. 

 89, f. 6625. Perideris saulcydi KOBELT, Conchyl. Cab., p. 

 42, pi. 13, f. 1, 2. 



Much shorter and more globose than P. saulcydi or var. 

 normalis, and the greenish yellow cuticle is persistent on the 

 last two whorls. The sculpture also is markedly different, 

 and the columella wider. The shell is much more globose 

 than P. torridus (Old.), thicker, and dark within. It is a 

 strongly characterized species, dedicated to the able author 

 of the later monographs on Acliatinidcc in the Conchylien 

 Cabinet. Fig. 23 is copied from one of Kobelt's. Fig. 24 

 represents the type specimen. 



21. P. TORRIDUS (Gould). PI. 12, figs. 25-28. 



Shell ovoid, the apex mamillate; rufous-chestnut, whorls 

 7, ventricose, striate, the last large, contracted towards the 

 base; suture marginate, conspicuously crcnulate. Aperture 

 small, ovate; columella white, brown-bordered, slightly trun- 

 cate at the base; lip simple, brownish, white within, and 

 thickened. Length 3.25, breadth 1.5 inch (Old.}. 



West Africa: Liberia (Perkins, Dohrn) ; Millsburg on the 

 St. Paul's river (Buttikoper) ; Junk river (Stampfli). 



Achatina torrida GLD., Proc. Bost. Soc. N. H., i, 1843, p. 



158 ; Otia, p. 191. Perideris torrida DOHRN, Malak. Bl., xxii, 



1875, p. 205. PFR., Novit. Conch., iv, p. 161, pi. 137, f. 1, 2. 



SCHEPMAN, Notes Leyden Mus., 1888, x, p. 248. KOBELT, 



Conchyl. Cab., p. 28, pi. 2, f. 4, 5; pi. 15, f. 1. 



Figures 25 and 28 represent the typical form. The shell 

 is either (1) white under a glossy, smooth, yellow cuticle, 

 which is worn from the spire, or (2) brown- tinted, or (3) 

 brown below the periphery, which is marked by an ill-defined 

 dark belt. The aperture is white inside, with a pale purplish 

 or livid tint, the lip rather sharp and brown at the edge. 

 The size varies a good deal : from 61 x 31 to 74 x 37 mm. in 

 specimens before me; while Dr. Gould's type was even larger. 



P. torrida has not the rough surface nor dark streaked 



