64 PALEONTOLOGY OF NEW JERSEY. 



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

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

 more inflated valves, and greater number of radii. 



Formation and locality.— hi the lower part of the Lower Green Marls at 

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



Suborder HETEROMYARIA. 



MYTILID^. 



Genus MYTILUS Linn. 



Mytilus 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. Anterior face ab- 

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

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

 as indicated on the cast. 



The species is known only 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, condecoratus, Conrad (Geol. Rept. 

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

 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. 



Modiola Julia. 

 Plate XVII, Figs, 6 and 7 ?. 



Modiola Julia he'd. Proc. A. K Sci., 1861, p. 149. Meek, Check-list, p. 11. 

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



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

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



