232 PALEONTOLOGY OF NEW JEESEY. 



Astarte planimarginata, u. sp. 

 Plate XXX, Figs. 3 and 4. 



Shell small, triangular, with sharp, pointed, incurved beaks, which 

 almost overhang the anterior end. Length seldom exceeding half an inch, 

 with about an equal height. Body of the shell below the beaks, as seen 

 in the cast, broadly round-triangular, and most convex just below the um- 

 bonal region. Cardinal margin slightly curved behind the beaks and con- 

 cave in front; basal line curved and passing imperceptibly into both the 

 anterior and posterior margins. Imprint of the hinge-plate broad and pro- 

 portionately large. Muscular imprints of moderate size and faintly marked. 

 Inner margin of the valves destitute of crenulations. 



This species differs from A. castenella Whitf. {znA. veta Conrad) in 

 being more distinctly triangular in the proportionally larger and more prom- 

 inent beak and broader hinge-plate, in the want of the posterior truncation 

 cf the margin, and the absence of umbonal angle, and in the smooth inner 

 margin of the valves, that one being strongly crenulate. In form this shell 

 strikingly resembles young specimens of Astarte castanea of our Atlantic 

 coast. 



Formation and locatity. — In the top layer of the Upper Green Marls at 

 Shark River, Squankum, and Farmingdale, New Jersey (P]ocene). 



Genus CARDITA Brug. 

 Cardita perantiqua. 



Plate XXX, Figs. 8-10. 



Cardita subquadrata Gabb. J. A. N. Sci., Phil., new series, Vol. IV, p. 303, PI. XLVIII, 

 Fig. 22 a, h (by error on PI. XXI). Synopsis, p. 105 Meek, Check-list, p. 11. 

 f Lea, Proc. A. K Sci., Phil., 1861, p. 150, 



Venericardia perantiqua Conrad. Am. Jour. Conch., Vol. T, p. 8. Meek, Geol. Snrv. 

 N. J., 1868, p. 731. 



Not Cardita subquadrata Conrad. J. A. X. Sci., new series, Vol. I, p. 128, PI. XIV, Fig. 9. 



Shell of medium size, with moderately convex valves and an obscurely 

 subquadrangular outline. Beaks fairly large, but not prominent, and scarcely 

 projecting above the cardinal line, but directed well anteriorly and enrolled. 

 Anterior end of the shell excavated in front of the beaks, rather sharpl}^ 

 rounded, and somewhat projecting beyond the beaks ; basal line moderately 



