MOLLUSCA. 433 



perfect, does not appear to have been winged on the anterior side. 

 Posterior extremity of the body of the (left) valve obtusely 

 pointed, and the anterior end narrowly rounded from the 

 extremity of the cardinal line. Basal line broadly curved, gradu- 

 ally descending from the anterior end to about the posterior 

 third of the length, where it again rises to the extremity. Beaks 

 small, rising a little above the hinge line, and prominently ventri- 

 cose. Surface of the shell marked only by concentric striae, so 

 far as can be determined from the partially exfoliated individual. 

 Right valve unknown." (Whitfield.) 



Remarks. This species was described from, a single specimen 

 of a left valve, and but a single example has been met with in 

 the recent collections of the Survey. 



Formation and locality. Woodbury clay, Haddonfield (183) ; 

 Red Bank sand, near Middletown (112). 



Geographic distribution. New Jersey. 



Genus MEXSAGRIN^I^A Whitfield. 



Meleagrinella abrupta (Conrad). 



Plate XLII., Figs. 5-9. 



1853. Avicula abrupta Con., Jour. Acad. Nat. Sci. Phil., 2nd 



sen, vol. 2, p. 274, pi. 24, figs. 5-6. 

 1 86 1. Avicida abrupta Gabb, Synop. Moll. Cret. Form., p. 157 



(101). 

 1864. Pteria abrupta Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 9. 



1868. Avicula abrupta Con., Cook's Geol. N. J., p. 726. 

 1886. Meleagrinella abrupta Whitf., Pal. N. J., vol. i (Monog. 



U. S. G. S., vol. 9), p. 72, pi. 14, figs. 11-14. 

 1905. Meleagrinella abrupta Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 10. 



Description. "Shell small, inequivalve, rhombo-quadrate in 

 outline, the hinge-line long and straight, reaching nearly the 

 entire length of the shell, beaks small, situated at about the 

 anterior third or fourth of the length of the hinge; that of the 

 left valve rising a little above the cardinal line, and that of the 



28 PAIv 



