218 DRYM^US, SOUTH AMERICAN. 



identified with it a shell in the Cuming collection, which he thu& 

 describes: 



" Shell subimperforate, ovate-conic, rather thin and smooth, 

 shining, whitish, painted with spaced purple-brown flames. Spire 

 conic, rather acute ; suture margined. Whorls 6, a little convex, 

 the last longer than the spire, dilated basally ; columella com- 

 pressedly folded, strongly receding, white. Aperture subvertical, 

 oval, wide at base, purple-bordered within ; peristome thin, widely 

 expanded. Alt. 21, diam, 11 mill.; aperture 16? mill, long, 11 

 wide.". (PL 41, figs. 27, 28). 



The identity of this with Lea's species is questionable. 



D. LINOSTOMA (d'Orbigny). PL 36, figs. 41, 42. 



Shell oblong, ventricose, very thin, diaphanous, smooth, glossy, 

 and appearing entirely smooth to the naked eye, but under a strong 

 lens showing very fine, ill-defined transverse lines ; dirty white or 

 slightly roseate, Avith wide and well spaced longitudinal flames of 

 brownish-violet. Spire conic, quite short, obtuse at apex, composed 

 of 5 wide, inflated whorls separated by a deep, smooth suture ; the 

 last whorl very large, more than half the total length. 



Aperture violet within, passing into rose, large, oval, a little ob- 

 lique, the peristome rose colored, much expanded and wide but not 

 recurved ; columella twisted, with a thick, prominent flange, leaving 

 quite a distinct umbilicus behind it. Alt. 29, diam. 14 mill. (Orb.~). 



North of the Mission of Bibosi, prov. Santa Cruz de la Sierra, and 

 other localities in Bolivia. 



Helix linostoma ORB., Mag. de ZooL, 1835, p. 19. Bulimus lino- 

 stoma ORB., Voy. Amer. Merid., p. 314, pi. 40, f. 9-11. REEVE, 

 Conch. Icon., pi. 55, f. 613. PFR., Monogr., ii, p. 35; iii, 334 ; iv, 

 392 ; Conchyl. Cab., p. 112, pi. 34, f. 11, 12.Bulimulus linostoma 

 BECK, Index, p. 63. Not B. linostoma Bland in Ad., Contrib. to 

 Conch., No. 11. p. 230. 



The Colombian shells identified with linostoma by Bland are D. 

 flexuosus ; D. linostoma is not known to occur in that country. 



D. SERRATUS (Pfeiffer). PL 36, figs. 46, 47. 



Shell perforate or rarely closed, ovate-conic, rather thin ; white 

 above the periphery with longitudinal purple-brown stripes, the 

 continuity of which is interrupted in two places by sharp arrow- 

 shaped zig-zags : the whorls of the spire with several spiral series of 



