﻿PALiEONTSCID^l. 487 



Acad. Sci. vol. vii. (1883), p. 179. The type species is very large 

 and described thus : — 



Aclinojyhorus clarhi, J. S. Newberry, ibid. p. 179, and Palaeoz. 

 Pishes 1ST. America (Mon. TJ. S. Geol. Surv. no. xvi. 1889), 

 p. 175, pi. xlix. fig. 1. — Cleveland Shale (Lower Carboni- 

 ferous) ; Cuyahoga Co., Ohio. [Anterior portion of fish ; 

 Columbia College, New York.] 



Genus ELONICHTHYS, Giebel. 

 [Fauna der Vorwelt, Fische, 1848, p. 249.] 



Syn. (?) PropalcBoniscus, A. Pomel, Catal. Method. Vert. Poss. 1853 



p. 133. 

 Rhabdolepis, F. H. Troschel, Verhandl. naturh. Verein. preuss. 



RheinL u. Westphal. 1857, p. 15. 

 (?) Ganacrodus, R. Owen,- Trans. Odontol. Soc. vol. v. 1867, 



p. 349. 

 Cosmoptychius, R. H. Traquair, Quart. Journ. Geol. Soc. 



vol. xxxiii. 1877, p. 553. 



Trunk more or less deeply fusiform. Mandibular suspensorium 

 very oblique; jaws stout and teeth acutely conical, arranged in two 

 series — an inner row of well-spaced laniaries and an outer row of 

 numerous, closely arranged small teeth ; bones of head and opercular 

 apparatus ornamented with tuberculations and striae. Pins large, 

 with fulcra, the rays branching dis tally, covered with ganoine, and 

 the more robust sculptured. Pectoral, pelvic, dorsal, and anal fins 

 triangular, acuminate ; pectoral fin-rays articulated ; pelvic fins 

 with short base-line ; dorsal opposed to space between the pelvic 

 and anal fins ; upper caudal lobe much produced, the fin deeply 

 forked and inequilobate. Scales of moderate thickness, very 

 slightly imbricating, covered with ganoine more or less sculptured ; 

 ridge-scales immediately in advance of median fins much enlarged. 



In the amended definition of this genus by Traquair (Ganoid 

 Pishes Brit. Carb. Porm. 1877, p. 47), the true interoperculum 

 (" suboperculum ") is stated to be absent. This element, however, 

 has subsequently been discovered as a small triangular bone 

 (Traquair, Proc. Roy. Soc. Edinb. vol. xvii. 1890, p. 397). 



Elonichthys germari, Giebel. 



1848. ElcnicMhys germari, C. G. Giebel, Fauna der Vorwelt, Fische, 

 p. 250. 



