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



by PI. Ill, Figs. I and 2, the rays constituting each lobe 



are comparatively few, and these are large, and cross-seg- 

 mented. In Anogmius , on the other hand, 

 the rays (Fig. 17, a fragment of the caudal 

 fin) appear to have been in greater number 

 and to have shown no segmentation, unless 

 this inay have appeared toward the distal 

 ends. It will likewise probably prove true 

 Fig. 17. Anogmius that in Pachyi'Mzodiis the neural and hsemal 



Fragment of ' caudal arclies of the caudal region are always con- 

 solidated with the centra, while in Anogfuius 



they remain distinct. 



Anogmius favirostris {Cope). 



Anogmius favirostris Cope (E. D.), Proc. Amer. Philos. Soc. XVII, 

 1877, p. 178. — Woodward (A. S.), Cat. Foss. Fishes Brit. Mus. 

 IV, 1 90 1, p. 73.— Hay (O. P.), Bibliog. Cat. Foss. Vert. N. A. 

 1902, p. 393, 



Osmer aides favirostris Loomis (F. B.), Palseontogr. XLVI, 1900, p. 256. 



This species was based on the skulls of two individuals, one 

 of them accompanied by a number of vertebrae. These speci- 

 mens are now in the American Museum of Natural History, 

 but they appear to be somewhat less complete than when 

 they were described by Prof. Cope. One of them, No. 21 11, 

 which must be regarded as the type, since from it the descrip- 

 tion was mostly drawn, consists of the rear of the skull and 

 some fragments of its upper surface, the premaxillae and 

 maxillae, the anterior portions of both dentaries, the anterior 

 half of the left palatine and the whole of the right, and a 

 considerable part of the parasphenoid. With these skull parts 

 are 11 vertebrae. 



The rear of the skull shows that the parietals are broadly 

 joined. Behind these is a narrow area occupied by the supra- 

 occipital and the epiotics, but the exact extent of these can- 

 not be determined. The midline of the rear of the skull is 

 occupied by a valley, deepest and widest between the parie- 

 tals, where its width is about 10 mm. 



Figure 18 presents a view of the front of the head, seen 



