DRYMJ5US, SOUTH AMERICAN. 289 



margin narrowly dilated and reflexed. Alt. 21, diam. 9 ; alt. of 

 aperture 8?, width 5 mill. (Smith). 



Zaruma, South Ecuador. 



Bidimus (Liostracms) flavidulus E. A. SMITH, P. Z. S., 1877, p. 

 364, pi. 39, f. 3. 



This pretty delicate species is easily recognized by its style of 

 coloration. The transverse series of squarish spots, which are some- 

 what distant from each other, are very constant. They are not 

 equally remote from one another, but sometimes three or four spots 

 are quite close together and thus form a short almost continuous 

 transverse band ; this is particularly the case with the two basal 

 bands on the body-whorl. As the shell is so thin and semitranspar- 

 ent, all the markings are visible within the aperture. The two 

 apical whorls under a strong lens are seen to be minutely granulated, 

 as is the case in many other species. B. ziegleri of Pfeiffer, var. /3?, 

 Mori. Hel., ii, p. 175 ; and B. maculatus Lea (?=B.maculatut Rve.), 

 have similar styles of marking. (Smith). 



D. FUSCOBASIS (Smith). Vol. XII, PI. 5, fig. 3. 



Shell narrowly perforate, long-conic, thin, semipellucid, shining ; 

 white, ornamented with transverse more or less interrupted brown 

 bands, 2 on the upper, 3 on the last whorl. Minutely striated spirally 

 throughout. Whorls 7 to 8, perceptibly increasing, a little convex, 

 the last with a scarcely interrupted basal band. Spire long, the apex 

 little acute, blackish. Aperture slightly oblique, white inside, the 

 bands showing through, about two-fifths the length of the shell ; per- 

 istome thin, scarcely expanded, the columellar margin reflexed. 

 Alt, 29, diam. 12 ; aperture 11 mill, long, 6* wide. (Smith). 



Tarapoto, Andes of Peru (Spruce, in Cuming coll.). 



Bulimus (Liostracus) fusco basis SMITH, P. Z. S., 1877, p. 365, pi. 

 39, f. 6. 



This species was labelled in Cuming's collection as B. lividus 

 Reeve. On comparing the two specimens of it with the types of 

 that species, I find certain characters which cannot be reconciled 

 with Reeve's shell. The form and proportion of the whorls are 

 different, also the length of the spire is greater in the present species, 

 and its black apex and banding are good specific distinctions. The 

 transverse bands in B. fuscobasis consist of elongate stripes, whilst 

 in B. lividus the bands take more the form of quadrate spots widely 

 separated. 

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