526 CRETACEOUS PALEONTOLOGY. 



Pormation and locality. — Navesink marl, Atlantic Highlands 

 (io8), near Crawfords Corner (126''), near Walnford (Whit- 

 field), near Arneytown (Morton). 



Geographic distribution. — New Jersey. 



Saper-family POROMYACEA. 

 Family FOROMYAOIDAB. 



Genus LiopisTha Meek. 



Liopistha protexta (Conrad). 



Plate LVIII., Figs. 4-6. 



1853 

 i860 

 1861 

 1864 



1868 



1875 

 1876 



1886 



1886 



1 90s 



Cardium protextum Con., Jour. Acad. Nat. Sci. Phil., 



2d ser., vol. 2, p. 275, pi. 24, fig. 12. 

 Fragilia protexta Con., Jour. Acad. Nat. Sci. Phil., 2d 



ser., vol. 4, p. 275. 

 Papyridea elegantula Gabb, Synop. Moll. Cret. Form., 



pp. 164, 218 (108, 162). 

 Papyridea (Liopistha) protexta Meek, Check List Inv. 



Foss. N. A., Cret. and Jur., p. 12. 

 Liopistha protexta Con., Cook's Geol. N. J., p. 726. 

 Liopistha protexta Con., Kerr's Geol. N. Car., App. p. 28. 

 Liopistha protexta Meek, Inv. Cret. and Ter. Foss. Up. 



Mo., p. 227, text figures 20-24. 

 Leiopistha protexta Whitf., Pal. N. J., vol. i (Monog. 



U. S. G. S., vol. 9), p. 140, pi. 20, figs. 1-3. 

 Leiopistha inUata Whitf., Pal. N. J., vol. I (Monog. U. 



S. G. S., vol. 9), p. 142, pi. 20, figs. 6-7. 

 Leiopistha protexta Johns., Proc. Acad. Nat. Sci. Phil., 



1905, p. 13. 



Description. — The dimensions of a large individual are: 

 length, 30.5 mm.; height, 22 mm.; thickness, 16.5 mm. Shell, 

 exclusive of the projecting beaks, subelliptical in outline. Beaks 

 prominent, situated a little in advance of the middle of the shell, 

 their apices pointed, incurved and nearly in contact. Antero- 

 cardinal slope slightly concave; anterior margin sharply 

 rounded; basal margin regularly convex throughout; posterior 



