375 Dominican Fossils — Maury 211 



Cardium {Trachycardium) Cinderella, n. sp. 

 Plate 36, Figure 4 



Shell sub-circular in outline, thin, rather fragile ; sculpture 

 of forty-four ribs distally channelled, adorned with close-set, con- 

 spicuous, spinose vaulted scales ; interspaces very narrow, 

 grooved, marked by microscopic, regular transverse strise. Length 

 25.5, altitude 26, thickness of one valve 10 mm. A member of 

 the Cardium muricatum group. 



This handsome shell is very rare. 



Locality. — (Exp'd' 16) Zone B, Rio Gurabo at Los Que- 

 mados. 



Cardium {Trigonicardia~) haitense Sowerby 

 Plate 36, Figures 5, 5a 

 Cardium Haitense Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, 



p. 52, pi. 10, fig. 11, 1S49. 

 Cardium Haitense Guppy, Id., vol. 22, p. 293, 1866. 

 Cardium (Fragum) Haitense Gabb, Trans. Amer. Phil. Soc, vol. 15, 



p. 251, 1873. 

 Cardium haitense Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 531, 



1876. 

 Cardium (Trigoniocardia) haitense Dall, Trans. Wagner Inst. Sci., 



vol. 3, pt. 5, pp. 1 103, 1 105, 1900. 

 Our specimens are divisible into two groups both with typi- 

 cally ten ribs on the truncation and fourteen on the body. (1) 

 Shells with the posterior slope from the beak to the margin 

 roundly angulated, outline subquadrate ; (2) shells with the pos- 

 terior slope very sharply angulate and the posterior margin cor- 

 respondingly produced. Sowerby 's figures indicate that he con- 

 fused these two forms in C. haitense. His upper figure (of the 

 exterior) agrees with his description that the slope is roundly 

 angulated, while the lower figure (of an interior) is evidently the 

 angulated shell with the posterior margin produced. The writer 

 would suggest restricting the true C. haitense to the first form 

 and calling the second by a varietal name, as indicated below, 

 since they seem to intergrade. C. haitense has also been report- 

 ed from Cumana and Bowden. 



Localities. — (Exp'd 'r6) Bluffs 2 and 3, Cercado de Mao ; 

 Zone G, Rio Gurabo ; Zone I, Rio Cana. 



