30 PALEO^'TOLCXrY OF NEW JERSEY. 



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

 shell ))etween the laniella\ This latter portion also is thick and very brittle; 

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

 shells also j)resent nnicli the appearance of GryphcBa vesicularis as it is 

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

 are so like tlie up})er valves of that species that they might readily escajie 

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

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

 not lie tlie lineal descendants of that shell over this area. 



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

 berland County, N. J., and in the near vicinity of Jericho. Mr. Com-ad 

 gives Stow Ch-eek as the locality for his shell, which is the stream upon 

 which Shiloh village is situated. 



Family PEGTENID/E. 



Geuus I'EGTEN Miill. 



Pecten Madisonifs. 



ri. IV, tif;-. l-.'>, and PI. il, lij;. 8. 



Pecten Madisonius iS;iy: Joiu". Acad. Nat. Sci., Phil., 1st Ser., vol. 4, p. l.'M; Courad 

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

 Check List, Mioceue Foss., p. 4; Heilpriu Proc. Acad. Nat. Sci., Pliil., 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 

 seal}- stria': r'ibti elevated, rounded, with about three striaj on the back of 

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

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

 the ear. 



"Length rather mons than four inches and a half; l)readth four inches 

 and four-fifths." 



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

 descri|)tion, that of stjuamose, longitudinal stria; in the depressions between 



