1 82 Bulletin 29 346 



merited by a series of wavy, concentric chestnut lines on a deep 

 cream background. 



Localities. — (Exp'd' 16) Bluff 3 (very common), Bluff 2 

 (very rare), Cercado de Mao. 



Genus Ostrea Linne 



Ostrea haitensis Sowerby 

 Plate 31, Figures i, 2 

 Ostrea Haitensis Sowerby, Quart. Jour. Geol. Soc, London, vol. 6, p. 



53, 1849. 

 Ostrea Havtensis Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 257, 



18-3. 

 Ostrea haitensis Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 532, 1876. 

 Ostrea haitensis Dall, Trans. Wagner Inst. Sci.,vol. 3, pt. 4, p. 685, 

 1898: pt. 6, p. 1586, 1903. 



Sowerby' s type had only six or seven large plications, but 

 one of our specimens has as many as fourteen, but six are strong- 

 er than the rest. Our shell bears a marked resemblance to 

 Gabb's Post-Pliocene Calif ornian O. Veatchii, which fide Gabb 

 and Dall is identical with the Dominican species. We have a 

 very fine, large specimen of O. haitensis, its length 122, altitude 

 140, semi diameter 25 mm. This species occurs at Bowden, and in 

 the Chipola and Oak Grove beds, Florida. 



Localities — (Exp'd '16) Zone D, Rio Gurabo at Los Que- 

 mados; Escalantes. 



Ostrea Gilbertkarrisi, n. sp. 

 Plate 32, Figures 1, 2, 3 



Shell large, thick and heavy, right valve deeper than the left 

 with a prominent, rounded, sub -central ridge extending from the 

 umbo halfway to the ventral margin, surface covered with irreg- 

 ular, concentric lamellae; not plicate radially ; as seen from the 

 interior, the right valve bears two deep, concave, sinuous undula- 

 tions, one very broad, anterior, the other deeper, posterior; be- 

 tween the two is a convex, tongue-like prolongation of the poster- 

 ior basal margin; on the inside of the left valve these undulations 

 are reversed, there being two convex and one very deep concave 



