MOLLUSCA. 817 



Family NAUTILIDAE. 



Genus NAUTILUS Linneus. 



Nautilus dekayi Morton. 



Plate C., Figs. 1-5. 



1833. Nautilus Dekayi Mort., Am. Jour. Sci., ist ser., vol. 23, 



p. 291, pi. 8, fig. 4. 



1834. Nautilus Dekayi Mort., Synop. Org. Rem. Cret. Gr. U. 



S., P- 33, P 1 - 8, fig-. 4, pi. 13, %. 4. 

 1856. Nautilus Dekayi Meek & Hayden, Proc. Acad. Nat. Sci. 



Phil, vol. 8, p. 280. 

 1859. Nautilus Dekayi Meek, Northwest Terr., Rep. Prog. 



Assin. and Saskat. Expl. Exped., H. Y. Hind, p. 185, 



pi. 2, figs. 9-10. 

 1861. Nautilus Dekayi Gabb, Synop. Moll. Cret. Form., p. 86 



(30). 

 1864. Nautilus Dekayi Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 25. 



1868. Nautilus Dekayi Con., Cook's Geol. N. J., p. 731. 

 1876. Nautilus Dekayi Gabb, Proc. Acad. Nat. Sci. Phil., 1876, 



p. 277. 

 1876. Nautilus Dekayi Meek, Rep. Inv. Cret. and Ter. Foss., 



Up. Mo., p. 496, pi. 27, figs. la-e. 

 1892. Nautilus Dekayi Whitf., Pal. N. J., vol. 2 (Monog. U. S. 



G. S., vol. 1 8), p. 243, pi. 37, figs. 1-6, pi. 38, figs. 1-4. 

 1894. Eutrephoceras Dekayi Hyatt, Proc. Am. Phil. Soc., vol. 



32, p. 555, Pi- 13, figs- 4-8, pi. 14, fig. i. 



1905. Eutrephoceras dekayi Johns., Proc. Acad. Nat. Sci. Phil., 

 1905, p. 28. 



Description. "Shell of medium size, strongly subglobose in 

 general form. In the condition of casts, that in which it is usually 

 found in New Jersey, it is slightly umbilicate\ but in the shell 

 the axis is solid and somewhat extended laterally from the body 

 of the volution, so that the posterior margin of the aperture 

 52 PAI, 



