628 CRETACEOUS PALEONTOLOGY. 



posteriorly near its lower extremity ; another much less conspicu- 

 ous furrow originates beneath the beak with the first one, and 

 extends backward, parallel with the hinge-line, becoming obso- 

 lete near the center of the shell. Surface of the cast apparently 

 smooth. 



Remarks. This shell is not a true Leptosolen, but seems to be 

 cogeneric with the shell which has been described as Leptosolen ? 

 terminates. It differs from that species in the nearly or quite 

 parallel dorsal and ventral margins, in its greater proportional 

 length, and in the absence of the diagonal umbonal ridge. 



Formation and locality. Red Bank sand, near Middletown 

 (112), Red Bank (116). 



Geographic distribution. New Jersey. 



Genus SIUQUA Muhlfeldt. 

 Siliqua cretacea Gabb. 

 Plate LXXL, Figs. 1-2. 



1860. Cultellus cretacea Gabb, Jour. Acad. Nat. Sci. Phil., 2nd: 



ser., vol. 4, p. 303, pi. 48, figs. 24 a-b. 



1861. Siliqua Cretaceous Gabb, Synop. Moll. Cret. Form., p. 



226 (170). 

 1864. Siliqua cretacea Meek, Check List Inv. Foss. N. A., Cret, 



and Jur., p. 15. 



1868. Ospirasolen cretaceus Con., Cook's Geol. N. J., p. 727. 

 1886. Siliqua Cretacea Whitf., Pal. N. J., vol. i (Monog. U. S. 



G. S., vol. 9), p. 186, pi. 25, figs. 9-10. 

 1905. Siliqua- cretacea Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 17. 



Description. "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 only coming in con- 

 tact 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- 



