258 DRYM^EUS, SOUTH AMERICAN. 



trigonostomus. His figures represent the streaked form (pi. 39, fig. 

 34) and the spotted typical pattern of trigonostomus. 



Var. correct (Pfeiffer). PL 39, figs. 31, 32, 33, 35 to 40. 



Shell very openly rimate-umbilicate, oblong, somewhat fusiform, 

 moderately solid ; varying from white or flesh-colored to elaborately 

 banded, streaked or maculated, generally with the lip bright yellow 

 within, often with scattered translucent gray dots. Smooth, shining, 

 showing under the lens slight growth-wrinkles and fine incised spiral 

 stride, often effaced in places. Spire straightly or convexly conic, 

 apex blue-black or pale, 1* earlier whorls sculptured in the typical 

 manner. Whorls 6? to 7, slightly convex, the last ascending in 

 front, somewhat compressed beneath. 



Aperture usually exceeding half the total alt., oblique or sub- 

 vertical, usually with vivid bands within ; peristome very broadly 

 expanded throughout; white, yellow or orange; columellar margin 

 obliquely sloping, straightened, usually impressed at its root ; col- 

 umella with a convex fold far above, sometimes obsolete. 



Alt. 36-37, diam. 17f-18 ; alt. of aperture 19 mill. 



Alt. 39, diam. 18; alt. of aperture 23 mill. 



Alt. 30, diam. 16 mill. 



Alt. 36*, diam. 15 mill. 



Venezuela: Puerto Cabello (Swift and others); La Guayra 

 (Swift) ; San Esteban (Simon). 



Bulimus correctus PFR., Zeitschr. f. Malak., 1852, p. 93 ; Conchyl. 

 Cab., p. 148, pi. 39, f. 3, 4 ; Monogr., iii, p. 330. Otostomus trigonos- 

 tomus (in part) MARTENS, Binnenmoll. Venez., p. 181, pi. 1, f. 9-13. 



Considered by von Martens a synonym of trigonostomus, from 

 which it differs in being more inflated, less compressed basally, and 

 with larger aperture. The coloring varies within wide limits, most 

 of the principal patterns being represented on plate 39. The main 

 color-varieties are as follows: 



Figs. 31, 32. Spire long, straightly conic; apex purple-black or 

 red. About five purple-brown spiral bands, and some oblique 

 streaks (typical correctus'). 



Fig. 39. Form similar, but spiral bands wanting or few and faint, 

 longitudinal streaks conspicuous. 



Fig. 37. Form similar. Uniform fleshy-brown, pale yellow or 

 white ; with or without a blackish subraarginal stripe within the 

 lip. 



