Eastman: catalog of fossil fishes in carnegie museum. 365 



Genus Macrosemius Agassiz. 



" Trunk gradually tapering from the occiput backwards ; head large, snout acute. 

 Teeth much elongated, closely arranged. Notochord persistent, without ring-verte- 

 brse; ribs ossified. Fins consisting of very robust, bifurcating rays, without fulcra 

 except in the caudal; pectoral fins much larger than the pelvic pair; dorsal fin arising 

 immediately behind the occiput and extending continuously to the caudal pedicle; 

 anal fin small; caudal fin rounded. Scales thin and more or less pectinated, with 

 peg-and-socket articulation, and apparently wanting towards the dorsal margin; 

 scales of the middle of the flank relatively large, becoming smaller both dorsally 

 and ventrally, in the former case by dichotomy of the vertical series; about four 

 very large ridge-scales on the ventral border between the anal and caudal fins." 

 (A. S. Woodward, I. c, Pt. Ill, pp. 176-7). 



Three species of Macrosemius have been described from the lithographic stone 

 of Cerin under the following names: M. dumortieri, M. fourneti, and M. helence 

 ThioUiere, the last-named imperfectly defined. A single fragmentary specimen, 

 catalogued as No. 4034, and probably belonging to this genus, is contained in the 

 Bayet Collection. 



Genus Notagogus Agassiz. 



"A genus scarcely distinguished from Propterus, differing only in the non- 

 elongation of the anterior rays of the dorsal fin, which are very widely spaced, and 

 in the less deeply forked character of the caudal fin. The vertebral rings also 

 appear to be more robust than in Propterus." (A. S. Woodward, I. c., Pt. Ill, p. 

 186). 



9. Notagogus inimontis ThioUiere. (Plate XLIX, fig. 2; Plate L, figs. 1, 2). 

 1850. Notagogus imimontis ThioUiere. 



Ann. Soc. Sci. Phys. et Nat. Lyon [2] Vol. Ill, p. 137. 

 1858. Notagogus iunismontis ThioUiere. 



BuU. Soc. Geol. France [2], Vol. XV, p. 783 (Name only). 

 1873. Notagogus inimontis ThioUiere. 



Poiss. Foss. Bugey, Pt. II, p. 15; pi. VI, fig. 3. 

 1893. Notagogus inimontis H. E. Sauvage. 



BuU. Soc. Hist. Nat. Autun, Vol. VI, p. 428. 

 1895. Notagogus inimontis A. S. Woodward. 



Cat. Foss. Fishes Brit. Mus., Pt. 3, p. 188. 



Type.— 'Nearly complete fish; Lyons Museum. 



A smaU species having about the same form and proportions as N. denticulatus, 



