PALiEOXISCIDJE. 
475 
Philad. vol. viii. (1856), p. 98. The specimen is regarded as 
Amphibian by E. D. Cope, ibid. 18/3, p. 418. 
Pyrjopterus Indus, L. Agassiz, Poiss. Eoss. vol. ii. pt. i. (1833), 
p. 10, is an undefined name applied to a head of Archegos auras, 
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, Erance, and the Calc-iferous Sandstone of Burdiehouse, near 
Edinburgh. The latter may be a synonym of Elonichthys buck- 
landi (E. H. Traquair, Quart. Journ. Geol. Soc. vol. xxxiii. p. 577). 
- pn p 
Genus TRACHELACANTHUS, Fischer de Waldheim. 
[Furze Beschreibung eines fossilen Eisches, Trachelacanthus, 1850.] 
Trunk elongated. Mandibular suspensorium oblique; jaws robust, 
provided with large, conical, laniary teeth. Eins 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 stschurovskii , G. Fischer de AValdheim, op. cit. 
(Moscow, 1850), pp. 9-11, with plate: Pcdceoniscus 
stschurowsJcii, E. von Eichwald, Leth. Eossica, vol. i. 
(1860), p. 1587.—Permian; Govt, of Wologda, Eussia. 
[Eish, wanting paired fins ; University of Moscow.] 
arnWH. Oof f-UW v» 
Genus UROLEPlC Bellotti. 
[In A. Stoppani, Studii Geol. e Paleont. Lombardia, 1857, p. 431.] 
l. 
An imperfectly defined genus of small Palgeoniscidae. Mandibular 
suspensorium oblique; dentition with powerful laniaries. Eins 
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 
