268 DRYM^EUS, SOUTH AMERICAN. 



earlier three tinicolored red brown, suture very delicately crenula- 

 ted, narrowly white. Aperture subvertical, two-fifths the total 

 length of the shell, ovate-elliptical, rounded at base; peristome ro- 

 seate, the outer margin unexpanded, basal slightly expanded, colu- 

 mellar margin dilated, reflexed ; columella twisted. 



Var. raristriga, generally a little more obese ; length 43, greater 

 diam. 18, lesser 13? ; aperture 19 mill, long, 9 wide inside. 



Var. webristriga painted with very close, very fine streaks and 

 three subarticulated bands. Alt. 47 J, greater diam. 15, lesser 13 ; 

 aperture 19 mill, long, 8 wide inside. (Martens'). 



On the Chanchamayo, an affluent of the Ucayali R., one of the 

 headwaters of the Amazon (Thamm) ; Tunin, Peru (Jelski) ; Napo, 

 Ecuador (Martinez). 



Buliniulus (Thawnastus) chrysomelas MARTENS, Malak. Bl., xiv, 

 1867, p. 145. Bulimus chrysomelas PER., Monogr., vi, p. 133 ; 

 Novit. Conch., p. 348, pi. 82, f. 1-5. HIDALGO, Journ. de Conch., 

 1870, p. 48. LUBOMIRSKI, P. Z. S., 1879, p. 724. 



Von Martens compares this with B. farrisi Pfr., but that is more 

 acute, with the last whorl larger proportionally, and it generally has 

 spiral striae. 



D. FARRISI (Pfeiffer). PI. 47, figs. 5, 6, 7. 



Shell openly rimate, fusiform-turrited, rather solid. Varying 

 from uniform opaque, rose-white, to densely speckled and streaked 

 with livid pink. Surface glossy, having rather coarse wrinkles 

 along the growth lines, and in some specimens spaced spiral striae, 

 visible under the lens. Spire drawn out, attenuated, frequently be- 

 coming ruddy or blackish near the apex, which when not lost (self 

 amputated?) is rather obtuse, the nepionic shell with 1| whorls with 

 typical Drymceus sculpture. Whorls 61-75, nearly flat, the sutures 

 very oblique ; last whorl usually somewhat obliquely produced, but 

 slightly convex above, tapering below. 



Aperture decidedly oblique, varying from bright orange or reddish 

 inside to yellow or purplish- brown, long-ovate, half the length of 

 shell or less ; peristome with a narrow white edge, not expanded ; 

 columella straight or with a slight fold above, concave below, white, 

 the margin broadly dilated above. 



Alt. 52, diam. 20-1 ; alt of aperture 23 mill. 



Alt. 42, diam. 15; alt. of aperture 19 mill. 



Andes of Peru, province of Patas. 



