MOLLUSCA. 623 



Genus Aenona Conrad. 



Aenona eufaulensis Conrad. 

 Plate IvXX., Figs. 24-25. 



i860. Tellina Eufaulensis Con., Jour. Acad. Nat. Sci. Phil. 2d 



ser., vol. 4, p. 277, pi. 46, fig. 15. 

 1861. Tellina Bufalensis Gabb, Synop. Moll. Cret. Form., p. 



229 (173). 

 1864. Tellina eufalensis Meek, Check list Inv. Foss. N. A., 



Cret. and Jur., p. 14. 

 1870. Mnona eufaulensis Con., Am. Jour. Conch., vol. 6, p. 74. 

 1886. Mnona Eufaulensis Whitf., Pal. N. J., vol. i (Moriog. 



U. S. G. S., vol. 9), p. 168, pi. 23, figs. 2-3. 

 1905. Mnona eufaulensis Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 16. 



Description. — "Shell small, triangularly ovate in outline, three- 

 fourths as high as long, with the small beaks situated a little more 

 than one-third of the length from the anterior end. Cardinal 

 margins rapidly sloping from the beaks, the anterior most rapidly, 

 and the anterior end sharply rounding just above the basal line; 

 posterior end more broadly rounded, but still narrowed; basal 

 line broadly curved. Surface of the valve smooth and semipol- 

 ished, the disk rather highly convex for a Tellina-like shell, with 

 very small pointed beaks, a slight angularity of the umbonal 

 region just in front of it, and a very narrow but distinctly cir- 

 cumscribed lunule. In the interior the hinge-plate is very narrow, 

 with a single small cardinal tooth in the right valve and very 

 small and narrow lateral teeth. Muscular markings unknown." 

 (Whitfield). 



Remarks. — This species is authentically recognized in the Cre- 

 taceous faunas of New Jersey only from Haddonfield. There 

 are some internal casts from the Wenonah sand near Marlboro 

 (locality 130), which more or less resemble Whitfield's illustra- 

 tion of this species, but they are probably all of them Tellinimera 

 ehorea, whose outline is similar to this species, but is proportion- 

 ally higher. 



