35-i Systematic Paleontology 



Corax falcatus Agassiz 

 Plate IX, Pig. 2 



Corax falcatus Agassiz, 1843, Recherches sur les Poissons Fossiles, tome iii, 



p. 226, pi. xxvi, fig. 14; pi. xxvia, figs. 1-15. 

 Corax heterodon Reuss, 1845, Verstein. bohm. Kreideform, pt. i, p. 3, pi. iii, 



figs. 49-71. 

 Corax heterodon Roemer, 1852, Kreidebild. von Texas, p. 30, pi. i, fig. 8. 

 Corax falcatus Pictet and Campiche, 1858, Foss. Terr. Cretace Ste. Croix, p. 



80, pi. x, figs. 1, 2. 

 Galeocerdo falcatus Leidy, 1873, Rept. U. S. Geol. Survey Terr., vol. i, p. 



301, pi. xvii, figs. 29-42. 

 Galeocerdo falcatus Cope, 1875, Rept. U. S. Geol. Survey Terr., vol. ii, p. 295. 

 Corax falcatus Smith Woodward, 1889, Cat. Fossil Fishes Brit. Museum, 



pt. i, p. 424. 

 Corax falcatus Williston, 1900, Univ. Geol. Survey, Kansas, vol. vi, p. 252, 



pi. xxxi, figs. 1-40; pi. xxxii, figs. 1-11. 

 Corax falcatus Hay, 1902, Bull. U. S. Geol. Survey, No. 179, p. 309. 

 Corax falcatus Fowler, 1911, Bull. 4, Geol. Survey of New Jersey, p. 63, 



fig. 28. 



Description. — Teeth variable, smaller and relatively higher than in 

 C. pristodontus, moderately broad, greatly compressed. Outer coronal 

 surface flat, inner convex. Anterior coronal margin moderately arched, 

 apex slightly inflected. Coronal serrations generally distinct, sometimes 

 absent in small teeth. No basal cusps. Eoot broad, deep, compressed, 

 emarginate below. Length 2 em. or less. 



This species is similar to the preceding, but never attains to the maxi- 

 mum size of the latter. Like all of the species of Corax it is only known 

 from the teeth, which are suggestive of those of the genera Sphyrna or 

 Carcharias, but differ in the absence of an internal cavity. 



Corax falcatus is a common and wide-ranging form. It is recorded 

 from the Cenomanian or Turonian in England, Prance, Switzerland, 

 Saxony, Bohemia, Galicia, and Eussia ; from the Senonian of England and 

 Prance. In the United States it has been recorded from the Niobrara 

 formation of Kansas and in the Atlantic Coastal Plain from New Jersey 

 to Texas. In the New Jersey area it appears to be confined to the Mon- 

 mouth and Manasquan formations, while in the South it appears to be 

 confined to earlier horizons. In Maryland it has thus far been found 

 only in the Matawan formation. 



