186 PAL.5;ONTOLOGY OF NEW JERSEY. 



form of the posterior end, and in the narrowing of the anterior portion in front 

 of the beaks. The specimen here used is in the collection of the Academy of 

 Natural Sciences, marked L. appressus in Mr. Conrad's handwriting, and is 

 accompanied by another, without mark, which agrees nearly enough with his 

 figure of L. dUpticum (J. A. N. S., Vol. Ill, PI. XXXIV, Fig. 19) to have been 

 the one used in making that figure. The two differ not only in the propor- 

 tional length and height, but in the form of the anterior ends and in the char- 

 acter of the surface markings, the latter one not having the regular ridges, but 

 irregular and fasciculate lines. By reference to the citations at the head of 

 this description it will be seen that Mr. Conrad has at diff'erent times referred 

 to Fig. 19 of PI. XXXIV, J. A. N. Sci., Vol. Ill, both as L. appressus and L. 

 ■eUipticus. The latter name being first applied to it, I suppose to have b6en 

 correct, and the reference later made to have been an error. Mr. Gabb, in 

 the Proc. A. N. Sci., 1876, p. 304, cites all these species under L. planuJata, 

 and considers them identical, considering the variations as different stages of 

 growth only. It would be difficult to account for the contraction of the an- 

 terior end in front of the beaks on this hypothesis 



Formation and locality. — In the dark micaceous clay below the Lower 

 Marls at Haddonfield, New Jersey. Collection of the Academy of Nat- 

 ural Sciences, Philadelphia. 



Genus SILIQUA Muhlfeld. 



SUiqua Cretacea. 



Plate XXV, Figs. 9 and 10. 



CulteUus cretacea Gabb. Jour. A. N. Sci., Phil., new ser., Vol. IV, p. 303, PL XLVIII, 



Fig. L'5 in text (24 on plate). 

 SUiqua cretacea Gabb. Synopsis, p. 170. Meek, Check-list, p. 15. Stoliczka, Pal. 



Indica, Vol. Ill, p. 100. 

 Ospriasolen cretacea (Gabb) Meek. Geol. Surv. N. J., 1808, p. 727. 



Shell of moderate size, the internal cast, and the only one known, being 

 nearly one and three-fourth inches long, and for the genus very convex, rather 

 strongly curved, and widely gaping at each extremity, the valves onl}^ com- 

 ing in contact in the middle of the basal margin; posterior end most widely 

 gaping. Beaks distinct, but not elevated, situated a little within the anterior 

 third of the shell's length. On the cast they slightly project above the 



