380 MEMOIRS OF THE CARNEGIE MUSEUM 
Genus Pyamus Agassiz. 
42. Pygeus nuchalis Agassiz. 
1835. Pygeus nuchalis L. Agassiz, Neues Jahrb., p. 302. 
1838-44. Pygeus nuchalis L. Agassiz, Poiss. Foss., Vol. IV, pp. 16,* 255, pl. 
DCIEIAV eat, 24, 
Type.—Imperfect fish; Paris Museum of Natural History. 
This unsatisfactorily known form is not represented in the collections of the 
British Museum. A single small example in the Bayet Collection, cataloged as 
No. 4232, is doubtfully referable to this position, and with it may be placed the 
fragment numbered 4217. 
Genus Epurppus Cuvier. 
43. Ephippus rhombus (Blainville). (Plate XCII, fig. 2.) 
1796. Chetodon mesoleucus G. 8. Volta, Ittiolit. Veronese, p. 41, pl. X, fig. 1 
(errore). 
1796. Cheetodon chirurgus G. 8. Volta, tbid., p. 177, pl. XLII. 
1818. Chatodon chirurgus H. D. de Blainville, Nouv. Dict. d’Hist. Nat., Vol. 
DEX ooo: 
1818. Chetodon rhombus H. D. de Blainville, ibid., p. 353. 
1823. Chetodon rhomboides J. F. Kriiger, Gesch. Urwelt, pt. II, p. 671. 
1842-44. Ephippus longipennis 1. Agassiz, Poiss. Foss., Vol. IV, pp. 15, 225, 
pl. XL. (mperfect fish; Paris Museum of Natural History.) 
1859. EHphippus longipennis A. B. Massalongo, Specimen Photogr. Anim. Foss. 
Agr. Veron., p. 34, pl. IX. 
1901. Ephippus rhombus A. S. Woodward, British Museum Catalogue Fossil 
Fishes, pt. IV, p. 559. 
Type.—Imperfect fish; Paris Museum of Natural History. 
One fine example of this species is preserved in the Bayet Collection, cataloged 
as No. 4463+ 4463a. It is somewhat smaller than the type, although nearly as 
perfect, but fails to display ova in the abdominal cavity as some others do. No. 
4463 is illustrated in Plate XCII, fig. 2. 
44. Ephippus oblongus Agassiz. 
1796. Chetodon asper G. 8. Volta, Ittiolit. Veronese, p. 90, pl. XX, fig. 1. 
1818. Chetodon substriatus H. D. de Blainville, Nouv. Dict. d’Hist. Nat., Vol. 
XXVII, p. 352. 
1835. Hphippus oblongus L. Agassiz, Neues Jahrb., p. 292. 
