156 BUIXKTIN 29 320 



down the southern slope, on the road from Rompino to Los Cao- 

 bas; also Zone G, Rio Gurabo at L,os Quemados. 



Genus Vitrinella C. B. Adams 



Vitrinella (Circulus) striata Gabb 



Plate 24, Figure 23 



Cyclostrema striata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 242. 1873. 



Our specimens correspond to Gabb's description of this unfig- 

 ured species, and appear to be identical. We have referred the 

 species to the section Circulus Jeffreys as redefined by Miss Bush. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. (Common.) 



Genus Teinostoma A. Adams 



Teinostoma sandomingense , n. sp. 

 Plate 24, Figure 24 



Shell small, orbicular, flattened, smooth and polished, 

 marked only by delicate growth-lines; spire somewhat concealed, 

 periphery convex, very slightly carinate; outer lip sharp; umbili- 

 cal region covered by a large flat callus; aperture sub-circular; 

 oblique, receding beneath. Diameter 4, altitude 1.54 mm. This 

 species is related to T. na?ium, from the Maryland Miocene and 

 is also akin to the recent T. cryptospira Verrill. 



Locality.— (Exp'd '16) Bluff 3, Cercado de Mao. (Very 

 rare. ) 



Genus Discopsis de Folin 



Discopsis Dei'byi, n. sp. 



Plate 24, Figure 20 



Shell minute, spire depressed, whorls four; upper surface 

 very finely, microscopically, spirally striated, and marked at in- 

 tervals by faint, curved lines of growth, last whorl flanged by a 

 very strong rounded carina revolving around the shell just be- 

 neath the periphery; base convex, ornamented with eight very 



