64 PALEONTOLOGY OF NEW JERSEY. 



The shell is quite variable in its general outline, being sometimes much 

 longer than high, in which case the prolongation is mostly anteriorly, 

 making the hinge line appear proportionally short, and throwing the beak 

 farther back. 



Locality: All the specimens which I have seen are from Jericho, N. J., 

 and are from the National Museum collection. 



LUCINA TRISULCATA. 



Plate x, figs. 1-4. 



Lueina trisulcata Conrad: Am. Jour. Sci., vol. 41, 1st ser., p. 346 ; Miocene Foss., p. 



71, PI. xi, fig. 5; Proc. Acad. Nat, Sci, Phil., 1862, p. 577; Meek, Check List 



.Miocene Foss., p. 8; Heilprin, Proc. Acad. N. Sci. Phil., 1887, pp. 400 and 403. 



"Obovate, convex; with concentric lines, and two or three distinct 

 concentric furrows; lunule profound. Differs from L. alveata of the lower 

 Tertiary in being less ventricose, and in the much more profoundl v impressed 

 lunule; the cardinal teeth are also very different." (Conrad in Journal 

 of the Academy of Natural Sciences of Philadelphia.) 



In the Miocene Fossils Mr. Conrad gives the following description: 

 "Ovate, convex, elevated, with two or three remote concentric furrows and 

 numerous concentric lines; anterior side rather longer than the posterior; 

 posterior margin subtruncated ; beaks prominent; lunule cordate and very 

 profound; inner margin crenulated; cardinal and lateral teeth distinct." 



The only specimens which I have seen from New Jersey are two 

 valves from the well-boring at Atlantic City, which, while differing very 

 materially from the figure given by Mr. Conrad, and, in some of their feat- 

 ures, from the descriptions, still possess characters that ally them specifically 

 with those from more southern localities. One of the principal differences 

 that I find is in the less convexity of these New Jersey specimens, which 

 are quite flat as compared with specimens from the Neuse River in North 

 Carolina. They are also more coarsely marked concentrically, the lines 

 being thicker and more recurved, while one of them is entirely destitute of 

 any indication of the deep concentric furrows. The shells are also thinner 

 on the hinge, and the teeth much less pronounced ; while the lunule in both 

 examples is very small and quite the opposite from "very profound," as 



