106 PALEONTOLOGY OF NEW JEESEY. 



his species to Yoldia albaria (=zNuculana albaria as herein used), and I have 

 changed Mr. Gabb's second one to Nuculana Gabhana; so that at present 

 only one species bears the name. 



Formation and locality. — In the Lower Green Marls at Crosswicks, and at 

 Mullica Hill, New Jersey. There are several specimens of the casts in the 

 collection of the Academy of Natural Sciences at Philadelphia from each of 

 the above mentioned localities, and one of those which I have figured I 

 suppose to be that originally figured by Mr. Gabb as above cited, but it is 

 labelled as from Crosswicks, N. J., while under the description Mr. Gabb 

 cites only Gloucester County, New Jersey. 



Nuculana Gabbana, n. sp. 

 Plate XI, Figs. 11-13. 



Ledia protexta Gabb. J. A. N. Sci., Phil., new ser., Vol. IV, p. 397, PI. LXVllI, Fig. .36. 

 Not Leda {Nuculana) protexta Gabb. Ibid., p. 303, PI. XL VIII, Fig. 23 (24 in text), or 



Meek, Geol. Surv. N. J., 1SC8, p. 725. 

 Not Nuculana in-otexta Conrad. Am. J. Coucli., Vol. I, p. 147, PI. II, Fig. 6 (Eocene) 



= N. albaria Con. 



Shell of moderate size, extremely elongated, the length being nearly 

 twice and a half the extreme height Valves convex, regularly and evenly 

 rounded. Beaks small, appressed and incurved, and distinctly inclined 

 toward the narrower end of the shell, scarcely rising above the hinge-line 

 on the wider part, and situated about two-fifths of the length from the 

 larger end. Cardinal margin on the wider end gently arcuate and a little 

 more strongly concave on the narrower side of the beak; large extremity of 

 the shell sharpl}^ rounded; basal margin gently rounded throughout and 

 the posterior end narrow and rounded. As the specimen is an internal cast, 

 it preserves no evidences of the surface characters. The muscular scars 

 are extremely faint and the pallial line undistinguishable, although the cast 

 is in an excellent state of preservation and somewhat polished on the surface 

 from the perfect condition. The hinge-line has been marked by a large 

 number of very fine teeth, gradually increasing in size from the center out- 

 ward. On the wider end of the shell there are about twenty-five visible 

 under a glass and about twenty somewhat stronger ones on the narrower 



