262 DRYM^US, SOUTH AMERICAN. 



Bulimus decoratus LEA, Trans. Arner. Philos. Soc., vi, 1836, p. 86, 

 pi. 23, f. 108 (June, 1838) ; Obs. Genus Unio, ii, p. 86, pi. 23, f. 108. 

 HIDALGO. Journ. deConchyl., 1870, p. 50. PFR., Monogr., ii, p. 

 182; iii, p. 375; iv, p. 444; vi, p. 80; viii, p. 11.8. Not Helix 

 decorata Fer., Prodr. no. 327, nor Bulimus decoratus Gray, Ann. 

 of Philos. (n. s.), ix, p. 413 (1825), and of some subsequent authors, 

 a form of Helicostyla (Manual, viii, p. 11). Drymwus decoratus 

 COUSIN, Bull. Soc. Zool. de France, xii, 1887, p. 214. Goniostomus 

 decoratus MILLER, Mai. Blatt, 1878, xxv, p. 192. 



Lea's form differs from that described by Reeve as B. chimboras- 

 ensis, in being decidedly broader, with a different band-pattern. The 

 specific identity of the two forms remains an open question. 



Figures and description are from one of the two types, U. S. Na- 

 tional Museum, No. 105,154. The locality given by Paz probably 

 pertains to D. chimborasensis. 



Var. goniobasis Pilsbry, n. v. PI. 40, fig. 4. 



Larger, with more elongate spire of 6 very convex whorls ; 

 three-banded on a pure white ground, the upper band very narrow, 

 all of a deep chestnut-brown color; the upper two bands ascending 

 the spire, earliest two whorls white. Aperture white with three 

 dark bands inside, terminations of the bands and the parietal wall 

 very faintly rose-tinted. Alt. 34*7, diam. 15'3 ; alt. of aperture 15*7, 

 greatest width 11 mill. 



Near Santa Ana, U. S. of Colombia (Bland). 



Group of D. nystianus. 



D. NYSTIANUS (Pfeiffer). PI. 46, figs. 63, 64, 65. 



Shell rimate or nearly imperforate, ovate-pointed, thin. Creamy 

 or yellowish-white, with irregular longitudinal streaks of brown or 

 blackish-brown, fainter near the suture, and frequently several 

 rather wide, light brownish spiral zones interrupted by light streaks. 

 Surface shining, with irregular wrinkles of growth and some appear- 

 ance of fine malleation. Spire conic, variable in length ; apex 

 slightly obtuse, the nepionic If whorls with very minute but typical 

 Drymceus sculpture. Whorls nearly 6, but slightly convex, the su- 

 tures superficial, irregularly crenulated ; last whorl large, oval, 

 rather ventricose, more or less distinctly angulated at base, the angle 

 bounding a flattened umbilical tract. Aperture oval, slightly ob- 

 lique, white or streaked inside, angular at the base ; outer lip thin, 



