476 CRETACEOUS PALEONTOLOGY. 



(103), Crosswicks (168), near Haddonfield (164, 168, 183); 

 Navesink marl (rare), near Crawfords Corner (126''), Mullica 

 Hill (169). 



Geographic distribution. — New Jersey. 



Pecten quinquenaria Conrad. 



Plate L., Figs. 10-13. 



1853. Pecten quinquenaria Con., Jour. Acad. Nat. Sci. Phil., 



2nd ser., vol. 2, p. 275, pi. 24, fig. 10. 

 1861. Neithea quinquenaria Gabb, Synop. Moll. Cret. Form., p. 



204 (148). 

 1864. Neithea quinquenaria Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 7. 

 1886. Pecten quinquenarius Whitf., Pal. N. J., vol i (Monog. 



U. S. G. S., vol. 9), p. 47, pi. 7, figs. 13-16. 

 1905. Pecten quinquenaria Johns., Proc. Acad. Nat. Sci. PhiL 



(1905), p. II. 

 Description. — "Shell of medium size, slightly oval trans- 

 versely ; in outline a little wider than high. Valves plano-convex 

 in profile when united. Hinge line much shorter than the width 

 of the shell below. Ears large, slightly unequal ; that of the flat 

 valve (right) somewhat sinuate on the anterior side. Cardinal 

 slope of the valves somewhat concave between the beaks and the 

 lateral margins of the body of the shell. Surface of the valves 

 marked by strong, wide, rounded, radiating ribs, about five on 

 the flat valve and six on the convex valve. On the convex valve, 

 as shown upon the impression left in the fine blue marl, there 

 have been fine, even, and closely arranged concentric lines cross- 

 ing the folds and passing up over the auriculations ; in fact, 

 covering the entire surface of the valve. The opposite flat valve 

 has not been marked by concentric lines, as was the convex valve, 

 the surface of the cast, both inside and outside impressions, being 

 ' apparently smooth. No remains of radiating lines on the folds 

 can be seen." (Whitfield.) 



Remarks. — This species occurs in abundance in the Wenonab 

 sand just beneath the base of the Navesink marl at a locality 

 near Miarlboro. Whitfield reports the species from the base of 



