1 3 Bulletin 29 182 



Genus Atys Montfort 



Atys doliolum, n. sp. 

 Plate 3, Figure 7 



Shell minutely cask-shaped, centrally inflated, narrowing to- 

 wards either end; aperture as long as the shell, extending behind 

 the inner lip and descending with a twist upon the apical region 

 of the concealed spire; outer lip rising abruptly above the peri- 

 phery, its outer margin forming an angle of about 65 , then 

 continuing in a gentle curve to the base, where it is slightly ex- 

 panded and sub-truncated; inner lip with a callus, thickest an- 

 teriorly; pillar straight, smooth; posterior periphery of body 

 whorl bordered with a callus band continuous with the callosity 

 of the inner lip and with the angulated margin of the outer lip ; 

 body whorl smooth medially, sculptured anteriorly and poster- 

 ly with fine, incised spiral lines. Length of shell 2.75, greatest 

 width 1.25 mm. 



This pretty and rare little shell is strikingly like the Chipo- 

 lan Oligocene species Atys oedemata Dall (Proc. U. S. Nat. Mus. 

 No. 1035, vol. 18, p. 28, 1895; Trans. Wag. Inst., vol. 3, pt. 6, 

 pi. 59, fig. 24, 1903). But the specimens described of that spe- 

 cies were nearly twice as large as our Dominican shells, and even 

 so were immature. The heavy callus bands would indicate that 

 our little shells have attained their full growth, though so minute. 

 Apparently this is the first A tys ever found in the Santo Domin- 

 go blue clays. 



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



Genus Btjllaria Rafinesque 



{Bulla Linne) 



Bullaria paupercula Sowerby 



Plate 3, Figure 8 



Bulla paupercula Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 



52, 1849. 

 Bulla paupercula Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 246, 1873. 



