30 PALEONTOLOGY OF NEW JERSEY. 
structure. This can readily be seen anywhere on the broken edges of the 
shell between the lamellz. 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 Gryphea 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 trom 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 PECTENID42. 
Genus PECTEN Miill. 
PECTEN MADISONIUS. 
Pl. rv, fig. 1-5, and PI. u, fig. 8. 
Pecten Madisonius Say: Jour. Acad. Nat. Sci., Phil., Ist Ser., vol. 4, p. 134; Conrad 
Mioc. Foss., p. 48, Pl. xxtv, fig. 1; Proc. A. N. Sci., Phil., 1862, p. 581; Meek 
Check List, Miocene Foss., p. 4; Heilprin 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 striz: ribs elevated, rounded, with about three striz on the back of 
each; intervening grooves rather profound: cars 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 striz in the depressions between 
