DRYM.EUS, SOUTH AMERICAN. 267 



Bulinus decoloratus SOWB., P. Z. S., 1833, p. 73. Bulimus decol- 

 oratus PFR., Monogr., ii, p. 211 ; iii, p. 424; vi, p. 132. REEVE, 

 Conch. Icon., pi. 21, f. 128. 



" The first two whorls of this shell are characterized by a very 

 minute shagreen appearance, discernable only with the lens " (Eve.). 



Reeve's figure does not agree with Sowerby's description in color- 

 pattern. I have not seen the species. 



D. VISENDUS (Hidalgo). PI. 51, figs. 9, 10. 



Shell nearly covered perforate, ovate-acuminate, hyaline, thin, 

 very glossy, striatulate ; green, encircled by many darker transverse 

 lines. Spire rather elongate-conic, the apex obtuse, rather pale. 

 Whorls 6J to 7, a little convex, the last one convex, a little descend- 

 ing in front, about three sevenths the length of the shell, rotund at 

 base. Aperture oval, colored like the outside ; peristome simple, 

 unexpanded, the margins joined by a very thin callus; right margin 

 subarcuate, subacute ; columellar margin narro\\ly reflexed, cover- 

 ing the perforation. Alt. 30, diam. 14 ; alt. of aperture inside 15, 

 width 8 mill. (Hidalgo). 



Baeza (Martinez) and San Jose (Espada), Ecuador. 



Bulimus visendus HID., Journ. de Conchyl., xvii, 1869, p. 50, pi. 

 5, f. 8 ; Journ. de Conchyl., 1870, p. 58 ; Catal. Coq. Terr., p. 33 ; 

 Mol. Viaje al Pacifico, p. 100, pi. 8, f. 1, 2. PFR., Monogr., viii, p. 

 150. Mesembrinus visendus MILLER, Mai. Bl., xxv, 1878, p. 191. 



The spiral lines are generally very fine, but sometimes some of 

 them are wider than others, particularly one about in the middle of 

 the last whorl. The suture is quite deep. It is distinguished from 

 other Ecuadorian forms by the thinness and shining appearance, 

 and especially by the quite deep green color of the shell. At San 

 Jose, M. Espada collected a very pretty variety, which is small and 

 ornamented with a white band around the base of the last whorl. 



(Hidalgo^). 



Group of D. farrisi. 



A group of Peru and Ecuador, comprising elongated, usually 

 much variegated shells with the lip simple and unexpanded. 



Probably some of the species included in the D. poecilus group, 

 such as canarius Ph., belong nearer these forms. 



D. CHRYSOMELAS (Martens). PI. 47, figs. 1, 2, 3, 4. 



Shell fusiform-elongate, perforate, rather coarsely striated, shin- 

 ing ; brown-black, with yellow streaks. Whorls 7, rather flat, the 



