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 xxi, 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 well. 

 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 vni, figs. 1 and 2. 



Astarte symmetrica Conrad ; Jour. Acad. Nat. Sci. Phil., 1st ser., vol. 7, p. 134; Medial 

 Tert. Foss., p. 44, PI. xxi, fig. 7; Proc. Acad. Nat. Sci. Phil., 1S62, p. 578; 

 Meek, Check List Miocene Foss., p. 7. 



" Shell subtriangnlar, 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- 



