MIOCENE MOLLUSCA AND CEUSTAGEA. 77 



label provisionally left with the specimen previous to the description and 

 name as published. The shell may be characterized as follows: 



Shell small, barely exceeding 1 inch in length by scarcely two-thirds of 

 an inch in height, and extremely delicate in texture; very depressed convex 

 and very slightly bent posteriorly ; beak small, appressed, and nearly sub- 

 central, being a little nearest to the posterior end. General outline trans- 

 verselv subovate, widest anteriorlv and broadlv rounded, the posterior end 

 narrower and obtusely pointed, postero-cardinal margin more rapidly declin- 

 ing than the anterior. A faint postero-umbonal ridge exists a little within 

 the margin of the shell. Surface of the valve marked by fine concentric 

 lines of growth parallel to the margin of the shell. In the interior the 

 muscular markings are quite faint, the scars very light, and only of mod- 

 erate size; pallial line very faint,- somewhat deeply excavated. Hinge 

 narrow, two small slender teeth under the beak; laterals moderately large, 

 the antero-lateral quite distinct. 



Locality : As stated above, there is only the one single authentic valve 

 known; this is labeled Shiloh, N. J., and I have seen no evidence of its 

 existence from any of the other Miocene localities within the State or else- 

 where. The specimen is from the collection of the Academy of Natural 

 Sciences at Philadelphia, Externally the shell bears a striking resemblance 

 to Tellina lusoria Sav, from the Miocene beds at Yorktown, Va,, but the 

 lateral teeth in this are very pronounced, especially the anterior one. 



Tellina (Angtilus) declivis. 

 Plate xiv, tigs. 4-6. 



Tellina declivis Say: Jour. Acad. Nat. Sci., 1st ser., vol. 7, p. 131; Conrad, Mioc. Foss., 

 p. 35, PL xix, fig. 1; Heilprin: Proc. Acad. Nat. Sci., 1887, pp. 401 and 403. 



TelUna (Angulus) declivis (Say) Conrad: Proc. Acad. Nat. Sci. Phil., 1862, p. 573; 

 Meek, Check List Miocene Foss., p. 10. 



" Shell triangular, convex, thin, with minute, regular concentric lines; 

 anterior side rather long, and very regularly rounded at the extremity; pos- 

 terior side short; umbonial slope straight, oblique, angulated; posterior 

 extremity obtusely angulated; lateral teeth distinct, but minute." (Conrad.) 



