5o6 CRETACEOUS PALEONTOLOGY. 



Modiola Julia Lea. 



Plate LV., Figs. 12-13. 



1861. Modiola Juli(s Lea, Proc. Acad. Nat. Sci. Sci. Phil. 



(1861), p. 149. 

 1864. Modiola Julice Meek, Check List Inv. Foss. N. A., Cret. 



and Jur., p. 11. 

 1868. Perna Julice Con., Cook's Geol. N. J., p. 726. 

 1886. Modiola Julia Whitf., Pal. N. J., vol i (Monog. U. S. 



G. S'., vol. 9), p. 64, pi. 17, fig. 6 (not fig. 7). 

 1905. Modiolus Julia John., Proc. Acad. Nat. Sci. Phil. (1905), 



p. 12. 



Description. — Shell subovate in outline, the dimensions of the 

 largest specimen observed being: length, 27 mm.; greatest 

 height, 13 mm.; convexity of one valve, 5.5 mm.; the hinge-line 

 about .63 of the total length; the beaks incurved, .situated 

 about one-seventh of the total length of the shell from the an- 

 terior extremity. Anterior margin rounded, meeting the hinge- 

 line in an obtusely rounded angle, ventral margin nearly straight 

 or slightly sinuate near the middle; if projected anteriorly it 

 would meet the projection of the dorsal margin in an angle of 

 about 16° ; posterio-r margin broadly rounded, its most posterior 

 projection below the middle. From the beak a rounded umbonal 

 ridge passes obliquely backward to the postero-basal margin, in 

 front of which is a rather broad,' shallow, ill-defined sulcus. The 

 surface markings of the shell consist of concentric lines of growth 

 which are stronger and more regular upon the posterior slope. 



Rejnarks. — The type of this species, from the Woodbury clay 

 near Haddonfield, is a badly crushed shell 13.5 mm, in length, 

 which is just one-half the size of the larger individual figured 

 in the present report from Lorillard. This fact is in agreement,. 

 however, \\'ith nearly all the species which are common to these 

 two localitie;, the Lorillard individuals generally being much 

 larger than those from Haddonfield. The Haddonfield speci- 

 men of this species is proportionally much shorter than those 

 from Lorillard, but this difference is doubtless due to the dis- 



