CEPHALOPODA. 39 



Nautilus (Discites) Marcellensis. 



PLATE I XXVI, FIG. 6. 



Nautilus (Discites) Marcellensis (Vanuxem), Ham. Pal V v.. vol. v, pt. 2, p. 428. 1879. 



GONIATITES, De Haan. 1825. 



GONIATITES VANUXEMI. 



PLATE (XXVII, FIGS. 3-6. 

 Goniatites Vanuxemi, Hall. Pal. N. V., vol. v, pt. 2, p. 4::4. 1879 



Goniatites Vanuxemi, var. nodiferus. 



PLATE XXVII, FIG. 7 

 [fifes V'titu r, mi, var. nodiferus, Hall. Fifth Ann. Rept. State Geologist. Expl. pi. (127) 12, fig 1 . 7 1886. 



Several specimens of Goniatites have been obtained from the shales of the 

 Hamilton group which agree in all essential features with the characteristic 

 species of the Marcellus shales, G. Vanuxemi (Pal. N. Y., vol. v, pt. 2, p. 434). 

 They are indicated as a variety on account of a row of distinct rounded nodes 

 around the dorsal or inner third of the periphery of the volutions. 



Distribution. In the shales of the Hamilton group, at Cherry Valley, Otsego 

 county. 



Goniatites discoideus. 



PLATE CXXVII, FIGS. II, 12. 



Goniatites discuidnts. Hall. Pal. N. Y., vol. v. j >t . 2, p. 441. 1879. 



Goniatites uniangularis. 



PLATE CXXVII, FIG. 10. 



Goniatites uniangularis (Conrad), Hall. Pal. N. Y., vol. v, pt. 2, p. 144. 1879. 



Goniatites amplexus. 



PLATE (XXVII, FIG. 1. 

 Goniatites amplexus, Hall. Fifth Ann. Rept. Stat.- Geologist. Expl. pi. (127) 12. fig. 1. 1886. 



Shell small, discoid. Volutions slender, rounded, embracing to the depth of 

 nearly one-half of their dorso-ventral diameter. Umbilicus large, open. 



