NEMATOGNATHI.

Pimelodus.

_P. antiquus_, Leidy. Pr. Ac. Nat. Sc., 1873, p. 99; Cont. to Ext.

Vert. Faun., p. 193.

Phareodon, Leidy. Pr. Ac. Nat. Sc., 1873, p. 99; Cont. to Ext.

Vert. Faun., p. 193.

_P. acutus_, Leidy, loc. cit.

_P. sericeus_, Cope, U. S. Geo!. Survey, 1872, p. 638.

Rhineastes, Cope. Pr. Am. Phil. Soc., 1872, p. 486; U. S. Geol.

Survey, 1872, p. 638.

_R. peltatus_, Cope, loc. cit.

_R. Smithii_, Cope, loc. cit.

_R. radulus_, Cope. U. S. Geol. Survey, 1872, p. 639.

_R. calvus_, Cope, loc. cit., p. 640.

_R. arcuatus_, Cope, loc. cit., p. 641.

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