DRYM^EUS, SOUTH AMERICAN. 293 



Bulimus primularis REEVE, P. Z. S., 1849, p. 100; Conch. Icon., 

 pi. 73, f. 527. PFR., Monogr., iii, p. 421. Bulimulus primularis 

 BINNEY, Ann. Lye. N. H., N. Y., ix, p. 37, pi. 1, f. vii (dentition).- 

 Mesembrinus primularis BINNEY, Ann. N. Y. Acad. Sci., iii, p. 122, 

 pi. 12, f. G (dentition). Otostomus (Mesembrinus ?*) humboldti var. 

 primularis MARTENS, Conchol. Mittbeil., p. 161. 



D. SEROTINUS Morelet. PI. 49, fig. 70. 



Shell unibilicate, ovate-acuminate, thin, rather smooth, subpellucid, 

 corneous-gray or corneous tawny, flamed ivith serrate white streaks, 

 and encircled below the middle of the last whorl by several bands. 

 Spire conic, acute ; whorls 7, little convex, the last attenuated at 

 base, compressed around the perforate umbilicus ; columella nearly 

 straight, or a little receding. 



Aperture semi-oval, angular below, showing the external coloring 

 within ; peristome thin, the right margin arcuately expanded, lightly 

 white-calloused; the columellar margin dilated, broad (Morel?). 



Alt. 26, diam. 10J mill. 



Alt. 32, diam. 12 mill, (more solid, larger form). 



Valleys of Andahuayles, Abancay and Chupan, Peru, in green 

 oasis at the valley bottoms (Angrand). 



Bulimus serotinus MOREL., Journ. Conch., 1860, p. 374 ; Ser. 

 Conch., iii, p. 207, pi. 11, f. 5. PER., Monogr., vi, p. 79. 



It is a thin and fragile, smooth and shining shell, remarkable for 

 the style of coloring, which consists of a corneous ground of a fawn 

 or grayish tint, upon which are white flammules, generally denticu- 

 late, intermingled with irregular little spots of the same color. 

 Sometimes, especially when the ground-tint is quite light, these 

 flammules produce a sort of cloudiness, comparable to the shades of 

 agate. On the lower portion of the last whorl these markings are 

 transformed into numerous narrow bands, which predominate to the 

 base and surround the umbilicus. In certain individuals the flam- 

 mules reappear at the extremity of the last whorl. 



D. LONGINQUUS (Morelet). PI. 50, figs. 93, 94. 



Shell narrowly umbilicated, oblong-turrited, thin, irregularly 

 striate; whitish, ornamented with brown streaks and somewhat in- 

 terrupted basal bands ; spire lengthened, acute. Whorl 7 to 8, a 

 little convex, the last rounded at base, five-sixths the length of the 

 spire. Aperture slightly oblique, oblong-oval, showing the streaks 



