246 DRYM.EUS, SOUTH AMERICAN. 



Aperture vertical (5 from the axis), as long as the spire, long- 

 oval, angular above, receding below and widely effuse, white, with 

 the bands showing through ; peristome expanded, subacute, white ; 

 outer margin arcuately dilated ; basal broadly retracted, columellar 

 narrowly reflexed above and appressed, then a little produced for- 

 ward ; columella obliquely twisted. Alt. 33, diam. 16 mill. (Mouss.*). 



Bogota (Wallis). 



Bulimus trivittatus Mouss., Malak. Bl., xxi, 1873, p. 11. PFR., 

 Novit. Conch., iv, p. 133, pi. 130, f. 3, 4 ; Monogr., viii, p. 53. 



This species approaches B. convexus Pfr., but the form is more 

 compact and stronger, the surface has only weak striation, instead 

 of irregular malleation and no trace of spiral lines. The last whorl 

 adjacent to the covered perforation is not compressed ; the axis 

 forms a prolonged fold, passing toward the columellar margin, etc. 

 The coloration consists of three broad black bands, the upper one 

 interrupted and ragged, instead of brown streaks. 



D. TRIBALTEATUS (Reeve). PI. 43, fig. 71. 



Shell somewhat fusiformly ovate, slightly umbilicated ; whorls 6, 

 convex, smooth or minutely longitudinally striated. Aperture 

 rather small, lip slightly reflected ; pale straw color, conspicuously 

 belted with three chestnut zones ; lip bright pink (jRve.). Alt. 24, 

 diam. 11 mill.; alt. of aperture 12 mill, (from fig.). 



Santa Fe de Bogota (Dennison coll.). 



Bulimus tribalteatus RVE., Conch. Icon., pi. 43, f. 269 (October, 

 1848). PFR., Monogr., iii, p. 342. DKR., Jahrb. D. M. Ges.,1882, 

 p. 380. 



Lehmann collected a form, referred by Dunker to this species, in 

 woods at Santiago, southern Colombia. It is white with roseate lip 

 and corneous apex, but without the chestnut bands. 



D. STUDERI (Pfeiffer). PI. 43, fig. 69. 



Shell perforate, oblong-conic, rather thin, striatulate, decussated 

 by close spiral lines, visible only under a lens, shining; white, or- 

 namented with 3 or 4 narrow rose colored girdles. Spire conic, 

 acute ; whorls 6, a trifle convex, the last about four-ninths the length 

 of the shell; columella arcuate. Aperture oval-elliptical, colored 

 within like the outside ; peristome simple, the margins somewhat 

 converging, right margin narrowly expanded, columellar margin 



