4 Bulletin American Museum of Natural History. [Vol. XIX, 



Vert. Cret. Form. West, 1875, pp. 217, 275, pi. xlviii, figs. 3-8; 



Bull. U. S. Geol. and Geog. Surv. Terrs. Ill, 1877, p. 821 (in part). 

 ProtosphyrcBna ntiida Newton (E. T.) , Quart. Jour. Geol. Soc. XXXIV, 



1878, p. 794. — Felix (J.), Zeitschr. deutsch. geol. Gesellsch. 



XLII, 1890, p. 278 (in part). — Woodward (A. S.),Cat. Foss. 



Fishes Brit. Mus. Ill, 1895, p. 409. — Loomis (F. B.) , Paleeontogr. 



XLVI, 1900, p. 227 (in part only). — Hay (O. P.), Bibliog. and 



Cat. Foss. Vert. N. A. 1902, p. 379. 

 Pelecopterus chirurgus Cope (E. D.), Vert. Cret. Form. West, 1875, 



pp. 244E, 273, pi. xlviii, fig. i; pi. liv, fig. 9. 

 Protosphyrcena chirurgus Hay (O. P.), Bibliog. and Cat. Foss. Vert. 



N. A. 1902, p. 379. 

 Erisichthe penetrans Cope (E. D.), Bull. U. S. Geol. and Geog. Surv. 



Terrs. Ill, 1877, p. 822. 

 Protosphyrcena penetrans Newton (E. T.), Quart. Jour. Geol. Soc. 



XXXIV, 1878, p. 795. — ^ Felix (J.), Zeitschr. deutsch. geol. Ge- 

 sellsch. XLII, 1890, p. 297, pi. xiv, fig. I. — Crook (A. R.), Palas- 



ontogr. XXXIX, 1892, p. 109. — Woodward (A. S.),Cat. Foss. 



Fishes Brit. Mus. Ill, 1895, p. 409. — Stewart (A.), Kan. Univ. 



Quart. VII, A. 1898, p. 192; Univ. Geol. Surv. Kansas, VI, 1900, 



p. 369, pi. Ixiii, fig. 4. — Loomis (F. B.), Palseontogr. XLVI, 1900, 



p. 227, pi. xix, figs. 1-5. — Hay (O. P.) Bibliog. and Cat. Foss. Vert. 



N. A. 1902, p. 379. 

 Protosphyrcena obliquidens Loomis (F. B.), Palaeontogr. XLVI, 1900, 



p. 225, pi. XX, figs. 1-4. — Hay (O. P.), Bibliog. and Cat. Foss. 



Vert. N. A. 1902, p. 379. 



The type of Professor Cope's Erisichthe nitida is now in the 

 American Museum of Natural History. It consists of both 

 premaxillae, a portion of the left dentary, and the adhering 

 postsplenial, the supposed hyomandibular, and a bone (Vert. 

 Cret. Form. West, pi. xlviii, fig. 7) which is as yet unidentified. 

 Of the same specimen Cope possessed also a fragment of the 

 fin, which lacked the anterior edge and was therefore not 

 susceptible of comparison with other species based on parts of 

 fins. This fragment is now missing. Dr. Loomis (Palseontogr., 

 XLVI, p. 228) has questioned that the fragment of the den- 

 tary figured by Cope belongs with the premaxilla ; but there 

 is no reason to doubt that all the parts of the type belong to 

 the same individual. As regards the premaxilla it may be 

 remarked that the anterior fang is probably directed more 

 horizontally forward than is natural, a fact due to pressure. 



