DRYM^EUS, SOUTH AMERICAN. 269 



Bulimas /arm 4 PFR., P. Z. S., 1858, p. 258, pi. 42, f. 8 ; Malak. 

 Bl., 1859, p. 46 ; Monogr., vi, p. 126. 



The figured type of D. farrisi is a much variegated shell (pi. 47, 

 fig. 6) with moderate umbilical crevice and "fusco-croeea" aperture. 

 Shells of this kind generally show minute incised spirals, rather sep- 

 arated, the intervals densely crenulated by vertical stride. From 

 this mean there are variations (1) toward uniform pink-white shells 

 with bright reddish-orange interior, rather wider umbilical crevice, 

 obsolete orsubobsolete spiral striation, and generally mutilated apex 

 (fig. 7), and (2) toward an even more speckled coloration, ruddy 

 apical whorls, brownish interior, almost appressed columellar lip 

 nearly closing the umbilical chink (fig. 5). These examples form 

 a passage to 



D. VESPERTINUS (Pfeiffer). PL 47, figs. 8, 9, 10, 11. 



Shorter than farrisi, with decidedly shorter spire, more oval body 

 whorl, which tapers more below, almost im perforate umbilical crevice 

 the columella plicate above with re flexed, appressed outer edge. Sur- 

 face smoothish, hardly wrinkled, with subobsolete spiral striation ; 

 coloring of red or dark reddish-brown streaks profusely dotted with 

 white, alternating with irregular white or pink streaks, the earlier 

 whorls reddish or blackish. Aperture half the alt. or somewhat 

 more, dark purplish-brown or reddish within, showing the external 

 pattern, decidedly narrower below than in D. farrisi ; lip simple, 

 thin ; basal lip decidedly receding ; whorls 6I-7L Alt. 35, diam. 

 15 ; alt. of aperture 18-19 mill. 



Province of Patas, Peru (Farris) ; Pataz (Paz.). 



Bulimus vespertinus PFR., P. Z. S., 1858, pi. 257, pi. 42, f. 3 ; 

 Malak. BL, 1859, p. 44 ; Monogr., vi, p. 109 ; Novit. Conch., iii, p. 

 465, pi. 101, f. 16-19. HIDALGO, Journ. de Conchy!., 1870, p. 63. 



There is a good deal of variation in size, more in coloring. In 

 some specimens a wide ill-defined pink zone revolves below the 

 suture and another around the columella, replacing the dark reddish- 

 brown streaks of the median part of the whorl. This form resembles 

 D. rubrovariegatus. It is very likely that more complete series will 

 show D. farrisi and D. rubrovariegatus to be merely varieties of D. 

 vespertinus. That they are all variable forms is demonstrated by 

 the series before me, in which the extreme forms are nearly con- 

 nected by intermediate examples. 



