263 Dominican Fossils — Maury • 99 



Subgenus NitideUvA Swainson 



Nitidella cibaoica, n. sp. 



Plate 2i, Figures 3, 4 



Shell polished and shining, somewhat Strombiform , smooth 

 except for growth lines and for faint, obsolete longitudinal rib- 

 lets on the first two post-nuclear whorls; spire elevated, acute, 

 suture distinct, linear; nuclear whorls two, post nuclear six, 

 gently convex; apeture acute posteriorly, widening and truncate 

 anteriorly; inner lip with two small plications; outer lip much 

 .thickened, its margin slightly inflected, bearing within about 

 ten denticles. Length 15, width 8 mm. 



This apecies appears somewhat intermediate between N. 

 nitida Lamarck and N. laevigata Linne, both now living in the 

 West Indies. 



Apparently this is the first Nitidella to be found in the blue 

 clays of Santo Domingo. 



Localities. — (Exp'd '16) Sandy clays of Rio Cana at Cai- 

 rn ito; Zone D, Rio Gurabo at Los Quemados. 



Subgenus Anachis H. and A. Adams 



Anachis exilis Gabb 

 Plate 21, Figure 5 



Strombina exilis Gabb, Trans. Amer. Phil. Soc, vol. 15. p. 222, 1873. 

 Not Strom bin a exilis Gabb. Jour. Acad. Nat. Sci. Phila., New Ser., 



vol. 8, p. 356, pi. 46, fig. 41, 1874 — 1 881. (S. divilitus Harris and 



Maury.) 

 Columbella exilis Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 



526, 1876. 

 Anachis exilis Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 1, p. 135, 



1890. 

 Anachis haitensis Dall, Id, pt. 6, p. 1584, 1903. Not haitensis Sow- 



erby. 



We have metatypes from Gabb and at least a thousand spec- 

 imens of our own of this pretty shell. It has been confused 

 with Strombina haitensis, but is perfectly valid and distinct. It 



