﻿pal^oniscid^. 475 



Philad. vol. viii. (1856), p. 98. The specimen is regarded as 

 Amphibian by E. D. Cope, ibid. 1873, p. 418. 



Pygopterus lucius, L. Agassiz, Poiss. Foss. vol. ii. pt. i. (1833), 

 p. 10, is an undefined name applied to a head of Archegosaurus, 

 from the Lower Permian of Saarbriick, in the Stuttgart Museum. 

 Pygopterus bonnardi, L. Agassiz (ibid. p. 11), and P. jamesoni, L. 

 Agassiz (ibid. pt. ii. 1844, p. 78), are also undefined names re- 

 ferring respectively to unknown fossils from the Lower Permian of 

 Autun, France, and the Calciferous Sandstone of Burdiehouse, near 

 Edinburgh. The latter may be a synonym of Elonichthys buck- 

 landi (R. H. Traquair, Quart. Journ. Geol. Soc. vol. xxxiii. p. 577). 



Genus TRACHELACANTHUS, Fischer de Waldheim. 

 [Kurze Beschreibung eines fossilen Fisches, Trachelacanthus, 1850.] 



Trunk elongated. Mandibular suspensorium oblique ; jaws robust, 

 provided with large, conical, laniary teeth. Fins relatively small, 

 with bifurcating rays and long, slender fulcra ; dorsal fin remote, 

 arising somewhat in advance of the anal. Scales small, deepest on 

 the flank, smooth or feebly ornamented with large oblique ridges ; 

 ridge-scales small, but prominent. 



The so-called spine beneath the jaws, to which the generic name 

 refers, is a false appearance (probably a displaced branchiostegal 

 ray) in the type specimen : but the genus is distinguished from 

 Palceoniscus, with which it is sometimes identified, by the dentition. 



The type and only known species is as follows : — 



Trachelacanthus stschurovsJcii, G. Fischer de Waldheim, op. cit. 

 (Moscow, 1850), pp. 9-11, with plate: Palceoniscus 

 stschurowsJcii, E. von Eichwald, Leth. Eossica, vol. i. 

 (1860), p. 1587.— Permian ; Govt, of Wologda, Russia, 

 [Fish, wanting paired fins ; University of Moscow.] 



Genus UROLEPIS, Bellotti. 

 [In A. Stoppani, Studii Geol. e Paleont. Lombardia, 1857, p. 431.] 



An imperfectly defined genus of small Palseoniseidse. Mandibular 

 suspensorium oblique; dentition with powerful laniaries. Fins 

 large, with fulcra, the dorsal opposed to the anal, and the latter 

 somewhat extended. Scales ornamented with few oblique ridges. 



The type species is Urolepis macroptera, C. Bellotti, op. cit. p. 432, 

 from the Upper Trias of Lombardy. The same horizon also yields 



