108 ARCHACHATINA. 



ashy-bluish with inconspicuous brown streaks, the spire 

 brown, variegated with whitish, early whorls dirty-white or 

 brown ; the suture has a whitish border below. Surface dull, 

 rudely marked with growth lines and folds, more or less 

 distinctly decussate below the suture, sometimes throughout. 

 Whorls 6^2 to 7, convex. Aperture blue-white with a pearly 

 luster within, quite oblique. Outer lip unexpanded, thin, 

 with a wide brown border within, columella not really trun- 

 cate below, but deeply recurved to join the effuse basal lip. 

 Parietal callous blue-white. 



Length 120, diam. 67, aperture 73 mm. 



Length 150, diam. 75 mm. (Dohrn.). 



Ilha do Principe (Prince's Island), in the uninhabited 

 mountain forests of the southern half of the island, on the 

 ground, (Dohrn) . Island of St. Thome at Roca Boa Entrada, 

 Rio do Ouro and Ilheo das Rolas (Greef) ; Roca Rocio, at 570 

 meters elev. (Moller) ; Morro do Gentio and Roca Minho 

 (Newton). 



Bulimus bicarinatus BRUG. Encycl. Meth. i, p. 359 (1792). 

 Helix bicarinata FEE., Prodr. p. 49, no. 350 ; Hist., pi. 128. 

 RANG, Ann. Sci. Nat. xxiv, p. 23. Achatina bicarinata 

 LAM. An. s. Vert, vi, p. 129; edit. Desh. viii, p. 296 REEVE, 

 Conch. Syst. ii. pi. 178, f . 13 ; Conch. Icon, v, pi. 5, f . 17.- 

 KUSTER, Conch. Cab. pi. 15, f. 3, 4. MORELET, Voy. Wel- 

 witsch p. 64. CROSSE, J. de Conch, xvi, 1868, p. 133. 

 DOHRN, Malak. Bl. xiii, 1866, p. 120. GIRARD Jornal de 

 Sci. Math., Phys. e Nat. iii, 1893, p. 109. Bulla achatina 

 sinistrorsa CHEMNITZ, Conch. Cab. ix, p. 28, pi. 103, f. 875-6. 

 Achatina sinistrorsa PFEIFFER Monogr. ii, 248; iii, 482; 

 iv, 600 ; vi, 211 ; viii, 271 ; Conchyl. Cab. p. 305 ; Novit, Conch, 

 p. 313, pi. 76, f. 1 (var. carnea) . DESK in Fer., Hist, p. 

 154, pi. 127 A. B. (soft anatomy). 



Dohrn, who collected this species on Prince's Island, writes 

 as follows: 



The color of the common variety is slate-blue verging into 

 black, the first whorl dirty-yellow, with broad brown flames, 

 the suture broadly bluish-white. Sometimes the shell, es- 

 pecially the lower whorls, is white-striped, but always quite 



