566 CRETACEOUS PALEONTOLOGY. 



Genus Vetericardia Conrad. 



Vetericardia crenalirata (Conrad). 



Plate LXIL, Pigs. g-io. 



i860. Astarte crenalirata Con., Jour. Acad. Nat. Sci. Phil, 



2nd ser., vol. 4, p. 282, pi. 46, fig. 25. 

 1861. Astarte crenulirata Gabb, Synop. Moll. Cret. Form., p. 



156 (100). 

 1864. Astarte crenulata Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 11. 



1867. Astarte corhicvia Con., Am. Jour. Conch. ? vol. 3, p. 12. 



1868. Gouldiai ? crenulirata Con., Cook's Geol. N. J., p. 726. 



1869. Vetocardia crenalirata Con., Am. Jour. Conch., vol. 5, 



p. 43, pi. I, fig. 23. 

 1872. Vetericardia crenalirata Con., Proc. Acad. Nat. Sci. Phil. 



(1872), p. 52, pi. I, fig. 4. 

 1886. Vetericardia crenulirata Whitf., Pal. N. J., vol. i 



(Monog. U. S. G. S., vol. 9), p. 128, pi. 18, figs. 5-7. 



Description. — ^"Shell small, not exceeding one-fourth of an 

 inch in length in adult individuals, subtriangular or broadly sub- 

 elliptical in outline, with very ventricose valves and proportion- 

 ally large, suberect beaks, which are situated a little in advance 

 of the middle. Surface marked by from 13 to 18 concentric 

 varices, according to the size of the shell, which gradually 

 increase in strength with increased growth of the shell. These 

 become obsolete at the margin of the proportionally large and 

 deeply impressed lunule. Interspaces flattened at the bottom, 

 and about as wide as the sharply elevated varices. There 

 are also- fine, but distinct elevated radiating lines crossing the 

 ridges and interspaces, becoming much stronger on the spaces 

 than on the ridges. In the interior the muscular imprints are 

 faintly marked and of moderate size, and the margin of the 

 valves is strongly and deeply crenulated by the radiating ridges. 

 Hinge-plate moderately strong and the teeth well marked." 

 (Whitfield.) 



