CEPHALOPODA. 
39 
Nautilus (Discites) Marcellensis. 
PLATE CXXVI, FIG. 6. 
Nautilus {Discites) Marcellensis (Vanuxem), Hall. Pal. N. Y., vol. v, pt. 2, p. 428. 1879. 
GONIATITES, De Haan. 1825. 
Goniatites Vanuxemi. 
PLATE CXXVII, FIGS. 3-6. 
Goniatites Vanuxemi, Hall. Pal. N. Y., vol. v, pt. 2. p. 434. 1879. 
Goniatites Vanuxemi, var. nodiferus. 
PLATE XXVTI, FIG. 7. 
Goniatites Vanuxemi, var. nodiferus. Hall. Fifth Ann. Kept. State Geologist. Expl. pi. (127) 12, fig. 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 discoideus. Hall. Pal. N. Y., vol. v, pt. 2, p. 441. 1879. 
Goniatites uniangularis. 
PLATE CXXVII, FIG. 10. 
Go7iiatites uniangularis (Conrad), Hall. Pal. N. Y., vol. v, pt. 2, p. 144. 1879. 
Goniatites amplexus. 
PLATE CXXVII, FIG. 1. 
Goniatites ainplexus. Hall. Fifth Ann. Kept. State 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. 
