86 PALEONTOLOGY OF NEW JERSEY. 



the specimen showing the interior both extremities would appear to have 

 been slightly gaping, but not widely so; the anterior end is broadly and 

 obliquely truncated, the truncation extending for nearly two-thirds of the 

 height from the dorsal line, and the gape has been throughout this distance. 

 Below the truncation the anterior end is sharply rounded and the base and 

 posterior end unite into one broad, nearly regular, curve. Surface of the 

 shell marked by fine concentric lines of growth and stronger undulations 

 of the surface. In the interior the spoon-shaped process of the hinge is 

 proportionally large and very thick, and the posterior ridge strong and well 

 marked, although the muscular markings are not traceable. 



It is entirely impossible to say if this is truly a Periploma or if it should 

 be classed with Anatina, as Prof. Heilprin has done. It appears to me, 

 however, that by its form it would come as near the one as the other, and 

 the right to either name will rest entirely on the equality or inequality of 

 the valves, and the apparent gaping of the shell at its extremities. 



Locality: It has only been found at Shiloh, N. J. Mr. Conrad says it 

 is an abundant species; although among two quite large collections from 

 that place, it is entirely unrepresented; the specimens borrowed from the 

 Academy of Natural Sciences are the only ones I have seen. 



Family CORBULIDiE. 

 Genus CORBULA Brug. 



CORBULA ELEVATA. 

 PL XV, figs. 15-19. 



Gorbula elevata Conrad: Miocene Foss., p. 7, PL IV, fig. 3; Catalogue in Proc. Acad. 

 Nat. Sci. Phil. 1862, p. 572; Meek, Check List Miocene Foss., p. 12; Heilprin, 

 Tert. Geol. U. S., p. 8; Miocene Moll. New Jersey, Proc. Acad. Nat. Sci. Phil. 

 1887, pp. 397, 401, 403. 



Gorbula levata (Con.) Meek: Miocene List, Oeol. New Jersey, 1863, p. 297 (typograph- 

 ical error). 



" Shell triangular, equilateral, height greater than the length, inferior 



valve ventricose, with regular numerous concentric impressed lines, which 



disappear on the posterior slope; umbo profoundly elevated; posterior 



slope with an obtuse furrow descending from the beak; extremity narrowed, 



slightly emarginate." (Conrad in Miocene Fossils, p. 7.) 



