208 PSEUDACIIATINA. 



strongly plicate, concave belt below. Aperture ovate, the peri- 

 stome broadly reflexed, white or flesh-tinted, somewhat thick- 

 ened within. Columella vertical, abruptly obliquely truncate 

 below, its spreading white or fleshy callous entering in a 

 spiral band around the insertion. 



Length 79, diam. 34 mm. (orig. fig.). 



Length 77, diam. 33, length of aperture 33 mm. 



Length 70, diam. 35, length of aperture 33 mm. 



Length 85, diam. 36 mm. 



W. Africa: Isowi, Kamerun (Jungner). 



Bulinus downesii Gray, SOWERBY, Conch. Illustr. Buli- 

 nus, f. 99 (1840?). Pseudachatina downesii Gray, IT. & 

 A. AD., Gen. Rec. Moll., ii, p. 134, pi. 75, f. 1. SHUTTLE- 

 WORTH, Notitise Malac., i, p. 85, pi. 9, f. 3, 4. PFR., Monogr., 

 iv, p. 597 (excl. syn.). KOBELT, Conch. Cab., p. 13. D'AILLY, 

 Bihang, etc., p. 86. Achatina leaiana GRATELOUP, Actes Soc. 

 Linn. Bordeaux, xi, p. 416, pi. 2, f. 7 (1839) Helix crenata 

 VALENC. in Paris Mus., teste Pfr. 



D'Ailly has restricted this species, excluding various forms 

 placed here by Pfeiffer, Reeve, Kobelt, and others. His 

 opportunities for the study of Pseudachatina give his opinions 

 great weight, and his interpretation has here been followed. 

 The original figure was not accompanied by a description, 

 merely by the name. It is reproduced on pi. 8, fig. 48. Gra- 

 teloup's Achatina leaiana was apparently based upon a form 

 of this species, and the name may have priority. The orig- 

 inal figure is copied, and the description given below. 



A. leaiana (pi. 16, fig. 67). Shell solid, conic-elongate, 

 glossy, subpellucid; white, the base reddish; with longitu- 

 dinal, oblique-waved wrinkles, some of them obscurely bifur- 

 cating; whorls 8, nearly flat except the apical whorls, which 

 are convex, smooth and reddish; aperture obovate, white in- 

 side; lip reflexed; columella callous. Length 70-75, diam. 

 30-33 mm. 



P. downesii is extremely variable in form, sculpture and 

 coloration. On pi. 3, fig. 10, a specimen is illustrated having 

 the rough sculpture of var. grandin&ta, and a strong, tuber- 

 culate peripheral angle. 



