ARCHACHATINA. 113 



paler above, right margin expanded. Length 105, diain. 55 

 mm., aperture 66x36 mm. (P/r.). 



"West Africa: Old Calabar (Cuming coll.). 



AcJiatina grevillei PFR., P. Z. S. 1860, p. 138; Malak. Bl. 

 viii, 1861, p. 78; Monogr. vi, 213. 



The systematic position of this species is unknown to 

 me. It has not been figured. 







Group of A. purpurea. 



The shell is solid or at least moderately strong, the interior 

 and columella lilac or purple. Lip usually not expanded. 

 Liberia to Kamerun. 



6. A. VENTRICOSA (Gould). PI. 21, fig. 8; pi. 23, fig. 19. 



Shell large, solid, conic-ovate; greenish-corneous, longi- 

 tudinally obscurely flammulate, granose-reticulate ; spire 

 conic, whorls G 1 /^, convex, the last ventricose, obtusely carin- 

 ate; suture subcrenulate. Aperture rounded-ovate, about 

 three-fifths the length of the shell; lip expanded, thickened 

 inside, the submargin and columella glossy purple; columella 

 very arcuate. Length 5, width 3y 2 inches; aperture 3 inches 

 long, 13,4 wide. (Gld.) . 



Closely allied to A. purpurea, but the form is constantly 

 more ventricose, and by comparing an extensive series, in- 

 cluding the young, the difference is plainly not accidental. 

 The color is more mixed with green and less conspicuously 

 fiammulated, and often flecked with triangular pale spots, and 

 the aperture more of a blood red. Dr. Perkins says it is 

 only found in the interior, while A. purpurea is found near 

 the sea. (Old.}. 



West Africa: Liberia, in the interior (Dr. Perkins). 



AcJiatina ventricosa GLD., Proc. Bost. Soc. N. H. iii, p. 

 195, (April, 1850). 1 A. purpurea REEVE, Conch. Icon, v, 

 pi. 4, f. 15a. ? Duennschalige Kinkkorn KNORR, Vergnuegen 

 der Augen und des Gemueths etc. iv, p. 39, pi. 24 * * * , 

 f. 1 (1769). 



The specimen figured on pi. 23, fig. 19 is not mature. It 

 is labelled Taboo, W. Africa, and measures, length 87, diam. 



