30 PALEONTOLOGY OF NEW JERSEY. 



structure. This can readily be seen anywhere on the broken edges of the 

 shell between the lamellae. This latter portion also is thick and very brittle; 

 differing in this character from that of the ordinary oysters. Many of the 

 shells also present much the appearance of Gryphma vesicularis as it is 

 found in New Jersey, Alabama, and Texas, and the upper valves sometimes 

 are so like the upper valves of that species that they might readily escape 

 detection were they accidentally placed among them. So striking, in fact, 

 is this resemblance that it readily suggests the inquiry whether they may 

 not be the lineal descendants of that shell over this area. 



Locality: Those which I have seen have been from near Shiloh, Cum- 

 berland County, N. J., and in the near vicinity of Jericho. Mr. Conrad 

 gives Stow Creek as the locality for his shell, which is the stream upon 

 which Shiloh village is situated. 



Family PECTENIDZE. 

 Genus PECTEN Miill, 



Pecten .Madison its. 



PI IV, hV l-r>, and PL n, ti^. 8. 



Pecten Madisonius Say: Jour. Acad. Nat. Sci., Phil.,_lst Ser., vol. 4, p. 134; Conrad 

 Mioc. Foss., p. 48, PI. xxiv, fig. 1; Proc. A. N. Sci., Phil., 1862, p. 581; Meek 

 Check List, Miocene Foss., p. 4; Heilpriu Proc. Acad. Nat. Sci., Phil.. 1887, 

 pp. 400-402. 



Say's description of this species is as follows: "Much compressed, 

 with about sixteen striated ribs. 



"Shell rounded, much compressed; the whole surface covered with 

 scaly striae: ribs elevated, rounded, with about three striae on the back of 

 each; intervening grooves rather profound: ears equal, sinus of the ear of 

 the superior valve profound, extending at least one-third of the length of 

 the ear. 



"Length rather more than four inches and a half; breadth four inches 

 and four-fifths." 



There is one important feature of this shell not mentioned in Say's 

 description, that of squamose, longitudinal striae in the depressions between 



