BULIMULUS-BOSTRYX-LISSOACME. 173 



ate, protracted above ; columellar margin broadly and triangularly 

 dilated, adnate above; parietal callus almost lack ing. {Miller}. 



Alt. 34, diam. 14; aperture 15-16 long, 8 wide (inside); whorls 

 8*. 



Alt. 30, diam. 14 ; aperture 15 long, 7 wide (inside) ; whorls 8. 



Dry Mountains on Catamayo R., Prov. Loja, Ecuador, 2000-3000 

 ft. above sea-level (Wolf). 



Thaumastus umbilicatus MILL., Malak. Bl. (n. F.), i, p. 122, pi. 

 12, f. 5; pi. 13, f. 1. 



Group of B. erythrostomus. 



B. ERYTHROSTOMUS Sowerby. PI. 48, figs. 1, 2, 97. 



Shell with large umbilicus, obesely ovate, solid, opaque and white, 

 with irregular indistinct fleshy or gray-blue streaks and small scat- 

 tered dots, the latter translucent by transmitted light, these markings 

 often inconspicuous ; earliest whorls fleshy or corneous, smooth. Sur- 

 face dull or slightly shining, with irregular wrinkles of growth, and 

 seen under the lens to be cut by superficial incised spiral lines into 

 series of long granules, often absent on middle and base of last whorl. 

 Spire short, conic, composed of 5*-5f very convex whorls, separated 

 by deep sutures. Last whorl rotund. 



Aperture slightly oblique, round-ovate, over half the shell's length, 

 crimson, rose or red-brown within, becoming light brown in the 

 throat; lip moderately thick but sharp, not expanded, the edge 

 light. Columella broadly dilated its inner edge straight or lightly 

 concave ; parietal callus thin, colored. 



Alt, 24, diam. 17 ; alt, of aperture 14 mill. 



Alt. 19*, diam. 13; alt. of aperture 10 mill. 



Alt. 18, diam. 15 ; alt. of aperture 10* mill. 



Huasco (Cuming) and Coquimbo (Paz), Chili. 



Bulinus erythrostoma Sows., P. Z. S., 1833, p. 37; Conch. 111., f. 

 50. Bulimus erythrostoma Sow., DESH. in Lam. An. s. Vert., viii, 

 p. 278. REEVE, C. Icon., f. 75. GAY, Hist. Chile, viii, p. 109, pi. 

 3, f. 3. PFR., Monogr., ii, p. 190 ; vi, p. 128 ; Conchyl. Cab., p. 199, 

 pi. 55, f. 9, 10. Bulimulus erythrostoma Sowb., BECK, Index, p. 68. 

 Bulimus erythrostomus HIDALGO, Journ. de Conchyl., 1870, p. 54. 



Very variable in size, width of umbilicus, and intensity of the 

 aperture coloring. Fig. 97 is a stunted, blue-tinged form from 

 Huasco, with very wide, deep umbilicus. 



