LAMELLIBEA^^TCHIATA OF THE LOWER MAELS. 101 



obliquity, which that species does not show. Mr. Gabb, in the Proceed- 

 ings of the Academy of Natural Sciences, Philadelphia, 1876, p. 317, con- 

 siders all the New Jersey forms and the Georgian shells as of one and the 

 same species, and refers with but little doubt A, hellasculpta Con. to the 

 same, but says nothing about his previously-described A. rotundata. He 

 also speaks of seeing and using the types of Dr. Morton's species, which I 

 have not been able to find, and, strange to say, I have not found a single 

 individual of Axinea from New Jersey in the Academy collections. 



Formation and locality, — In the Lower Marls of the Cretaceous at Holm- 

 del; Walnford, Manalapan, at George Hunt's pits, N. J.; Mr. Conrad cites 

 Crosswicks, New Jersey. 



Axinea alta, n. sp. 

 Plate XI, Figs. 26-29. 



The casts of this species are usually somewhat larger than those of A. 

 Mortoni, and are more elevated at the beak; the filHngs of the rostral portions 

 being very long and curved inward toward each other, showing that the 

 hinge-plate has been very wide, and the beaks probably considerably 

 projecting beyond its margin. In these casts the portion which extends 

 above the line of jimction of the plates of the two valves measures about 

 two-fifths of the entire height of the cast. Muscular scars rather large and 

 distinct, the line of advance being marked on both by a distinct ridge on 

 the cast. Margin of the cast below the pallial line, broad, and the border 

 strongly crenulate. Teeth strong and but few in number, and distinctly 

 bent downward at their inner ends, while their direction is more lateral 

 than in A. Mortoni Central parts of the hinge, cardinal area, and exterior of 

 the shell unknown. 



Among the New Jersey specimens the elevated beaks, less rotundity 

 of the valves, and stronger and more outwardly directed teeth will serve to 

 distinguish this from A, Mortoni. From the Alabama and other southern 

 species there is almost no means of comparison, as no part of the shell of 

 this one has been seen. 



Formation and locality, — In the Lower Marl Beds of the Cretaceous at 

 C. Bruere's pits, Walnford; also at Upper Freehold, New Jersey. 



