64 PALEONTOLOGY OF NEW JERSEY. 



area or cartilage pit; and none of them exhibit the shghtest evidence of a 

 byssal sinus. The species differs from R.pelagica, Mort., in its smaller size, 

 more inflated valves, and greater number of radii. 



Formation and localitij. — In the lower part of the Lower Green Marls at 

 Upper Freehold, New Jersey. Collected by Dr. Bruere. 



Suborder HETEROMYARIA. 



mytilidJ:. 



Genus MYTILUS Liun. 



MytiluB oblivius, u. sp. 



Plate XVII, Fig. 1. 



Shell small, erect, or but very slightly curved on the buccal margin ; 

 beaks terminal, projecting and acute. Hinge line sloping at an angle of 

 about sixty degrees to the buccal margin; posterior margin subparallel to 

 the anterior, and the extremity rather sharpl}^ rounded. Anterioi- fnce ab- 

 rupt, and the surface of the valve gradually sloping from the umbonal angle 

 to the posterior margin. Surface apparently marked by line lines of growth 

 as indicated on the cast. 



The species is known onlj^ from a single cast of a left valve, which so 

 nearly resembles all other species of Mytilus that but little comparison can 

 be instituted. It is more nearly like M. condeco)-atus, Conrad (Geol. Rept. 

 N. Carolina, Kerr, Appendix, p. 5, PI. I, Fig. 10), than any other Cretaceous 

 form I know, but is decidedly longer in proportion to its width. 



Formation and locality. — In the micaceous clay under the Lower Green 

 Sand at the pits of the Rev. G. C. Schanck, near Marlborough, New Jersey. 

 From Mr. Lockwood's collection. 



Genus MODIOLA Lam. 



Modlola Julia. 



Plate XVII, FiRS. 6 aud 7 ?. 



Modiola Julia Lea. Proc. A. N. Sci., 1861, p. 149. Meek, Checklist, p. 11. 

 Perna Julia (Lea). Meek, Geol. Surv. N. J., 1868, ]). 726. 



Shell rather small, measuring only about nine-sixteenths of an inch in 



its greatest length, which is about twice tlie height. Form elongate-ovate, 



