DKYM.Kt >. 155 



in having a whorl less. As usual in Drymceus^ the coloration varies 

 a good deal in peelii, a specimen with but few markings being illus- 

 trated here. 



D. COGNATUS n. sp. PI. 23, figs. 3, 4, 5, 6, 7. 



Shell fusiform, thin, white with corneous or purplish wavy longi- 

 tudinal streaks or bands dotted with white, often combined with three 

 dark girdles, continuous or interrupted, and also white-dotted. Spire 

 long and slender, the first 1 J whorls with typical Drymaus sculpture, 

 succeeding whorls somewhat glossy, marked with slight growth-lines 

 and faint spiral incised striae. Whorls 6^ to 7, slightly convex. 

 Aperture vertical, ovate, showing the external color-pattern vividly 

 within, the peristome thin, broadly expanded, subveflexed, white, 

 usually tinted with lilac within ; columellar margin broadly dilated 

 above, over an ample and deep umbilical fissure ; columella entering 

 as a very strongly spiral fold. 



Length 45, diarn. 18^, longest axis of aperture 21^ mill. 



Length 39, diam. 16, longest axis of aperture 19 mill. 



Length 33, diam. 14. longest axis of aperture 16^ mill. 



Colombia : Bogota. 



This species is closely related to D. zoogeographicus Orb. and D. 

 membielinus Crosse, but seems distinct from both. The figures show 

 sufficiently its wide range of variation in color and size. In some 

 specimens there are no purple-black markings, while in others these 

 replace to a large extent the corneous brown portions of the pattern 

 of paler shells. 



D. EXPANSUS (Pfeiffer). PL 25, figs. 25-29. 



Vol. xi, p. 222. This species has a wide range of variation, as 

 shown by an extensive series collected by Prof. Steere at Tarapoto, 

 Peru. It undoubtedly includes D. scitus and D. protractus as var- 

 ieties. At Tarapoto specimens similar to pi. 34, f. 5 of vol. xi, oc- 

 curred with typical var. aurisratti, and a smaller form, pi. 25, figs. 

 25, 26. At another locality, unfortunately not noted, the specimens 

 are all small, varying from almost typical expanses contour to a much 

 narrower form with reduced umbilical chink ; white with inconspic- 

 uous corneous streaks, or copiously marked, the apex black ; lilac tint 

 within the mouth almost invisible, faint, or strong (pi. 25, figs. 27, 

 28, 29). I have called this form var. subprotractus. 



