AMPH1DROMUS, GROUP VI. 165 



A. ATRICALLOSUS (Gould). PI. 58, figs. 19, 20, 21. 



" Shell imperforate, elongated ovate, solid, smooth, and shining, 

 of a sulphur-yellow color ; whorls seven, moderately convex, some- 

 what girt in near the suture ; last whorl nearly two-thirds the length 

 of the shell ; aperture ovate-lunate, somewhat angular at base, and 

 slightly effuse ; lip white, widely revolute, not flattened ; columella 

 white, the callus uniting the extremities of the peristome, and as far 

 within the shell as can be seen, pitchy-black ; from the midst of it, ex- 

 tending across the penult, whorl, is a line of the same color, showing 

 the termination of a former stage of growth. Length 2^ inches ; 

 breadth 1 inch" (Old.). 



Tavoy, British Burma (Rev. F. Mason) ; Mergui and King Is. 

 (Anderson) ; Salanga 1. (Weber) ; Penan g (Martens) ; probably 

 Siam (Schomburgk). 



Bulimus atricallosus GLD., Proc. Bost. Soc. Nat. Hist, i, p. 141 



(1843); Bost. Journ. of Nat. Hist, iv, p. 457, pi. 24, f. 3 REEVE 



Conch. Icon. pi. 31, f. 188. DESHAYES in Fer., Histoire, p. 51, pi. 

 130, f. 9, 10. B. (Amphidromus} atricallosus MARTENS, Conchol. 

 Mittheil., p. 130, 131 ; Journ. Linn. Soc. Lond., xxi, 1889, p. 163; 

 and POstas. Landschn. p. 77. B. perversus MARTENS, P. Z. S. 

 1860, p. 9 Amphidromus perversus var. atricallosa FULTON, Ann. 

 Mag. N. H. (6) xvii, p. 69 Bulimus perversus var., PFR. Monogr. 

 iii, p. 309 ; Conchyl. Cab., Bui., pi. 40, f. 10, 11.?^. atricallosus 



SEMPER, Reisen, Phil., Landmoll., p. 147, pi. 16, f. 20 (teeth) 



Bulimus eques PFR., Malak. Bl. iv, 1857, p. 158 ; Monogr. iv. 373; 

 vi, 19. 



Distinguished by its robust contour and blackish-brown parietal 

 callus (whence the name atricallosus), but closely allied to leuco- 

 xanthus. It is apparently a coast species, ranging from Tavoy, in 

 British Burma, to Salang Island and Penang. Semper doubts the 

 identity of the specimens collected by him at Saigon, Cochin China, 

 but gives no information about the shell*. Pfeiffer, however, gives 

 Cochin China as habitat of his B. eques, which is a synonym of 

 atricallosus ; and this lends probability to the statement of a more 

 eastern distribution. Von Martens saw specimens in Schomburgk's 

 collection at Bangkok, probably Siamese. The type is in the State 

 Museum at Albany, N. Y., no. A6524. 



Dr. Anderson collected 17 dextral and 4 sinistral examples in the 



