54 PALEONTOLOGY OF NEW JERSEY. 
their margins sharply angular. Hinge plate wide below the beak, and the 
teeth large and strong, coarsely but faintly crenulated on the sides. Mus- 
cular imprints well defined, but not deeply marked; pallial line distinct ; 
margin of the valves very distinctly crenulated. 
This is a very abundant species, and is a very close relative of Astarte 
undulata Say, from the more Southern outcrops of the Miocene beds. It 
does not attain so great a size, however, and is almost destitute of the hunch- 
backed character of the posterior slope of that one. Were it not for this one 
feature it might readily be mistaken’ for a young or immature form of that 
shell; as it corresponds so nearly in character to the earlier two-thirds of 
the growth of it. It also has considerable resemblance to A. perplana Say, 
as given by Mr. Conrad in his Foss. Medial Tert., Pl. xx1, Fig. 3, in general 
form, but the undulations are much more distant than on that one. 
Localities: The species has been obtained from Shiloh, Jericho, and 
Bridgeton, N.J.; in the gray marls and in the chocolate clay marls as weil. 
In Meek’s Check List of Miocene Fossils he gives the locality Maryland? 
I do not think, however, it has ever been obtained beyond the limits of New 
Jersey. 
ASTARTE SYMMETRICA. 
Plate vit, figs. 1 and 2. 
Astarte symmetrica Conrad; Jour. Acad. Nat. Sci. Phil., 1st ser., vol. 7, p. 134; Medial 
Tert. Foss., p. 44, Pl. xxi, fig. 7; Proc. Acad. Nat. Sci. Phil., 1862, p. 578; 
Meek, Check List Miocene Foss., p. 7. 
“Shell subtriangular, convex, with concentric impressed lines or undu- 
lations; anterior, posterior, and basal margins regularly rounded; apex 
rather prominent, acute, nearly central; lunule concave, ovate-acute; car- 
dinal teeth very prominent, striated; margin crenulated. Length three- 
fourths of an inch; height rather less. 
“This species may be distinguished from A. vicina Say, by the lunule, 
which is much less excavated, and the shell is also less convex than in the 
latter species.” (Conrad, Jour. Acad. Nat. Sci., Phil.) 
A single valve of a specimen of this species only has been obtained 
from the well-boring of Mr. Woolman, at Atlantic City, N. J., and is pre- 
