﻿PALiEONISCID^J. 



505 



1864, p. 350). The type specimen is an imperfect fish in the 

 Museum of Newcastle-upon-Tyne. 



Two portions of large fishes, also closely resembling^. sedc/wicJci, 

 from the Permian of Kargala, Govt, of Orenburg, Russia, are 

 described thus: — 



Acrolepis macroderma, E. von Eichwald, Bull. Soc. Imp. Nat. 

 Moscou, vol. xxx. (1857), pt. ii. p. 349, and Leth. llossica, 

 vol. i. (1860), p. 1579, pi. lvi. fig. 9. 

 Acrolepis rJtombifera, E. von Eichwald, Leth. llossica, vol. i. 

 (1860), p. 1580, pi. lvi. fig. 8. 



Acrolepis exsculpta (Kurtze). 



1839. Palceoniscus exscidptus, G. A. Kurtze, Comment. Petrefact. 

 Mansfeld. p. 19, pi. ii. fig. 1. 



1840. Palceoniscus exsculptus, E. F. Germar, Verstein. Mansfeld. Kup- 

 ferschief. p. 21, figs. 6-8. 



1842. Acrolepis ornatus, G. von Miinster, Beitr. Petrefakt. pt. v. p. 41. 

 [Palseontological Museum, Munich.] 



1842. Acrolepis exsculptus, G. von Miinster, ibid. p. 42, pi. vi. fig. 2. 



(?) 1842. Acrolepis intermedins, G. von Miinster, ibid. p. 41. [Palae- 

 ontological Museum, Munich.] 



1844. Pygopterus humboldti, L. Agassiz (errore), Poiss. Foss. vol. ii. 

 pt. ii. p. 74. 



1848. Acrolepis exsculptus, C. G. Giebel, Fauna der Vorwelt, Fische, 

 p. 242. 



1861. Acrolepis exsculptus, H. B. Geinitz, Dyas, p. 14. 



1889. Acrolepis exculptus, R. Howse, Guide Local Foss. Mus. New- 

 castle-upon-Tyne, p. 24. 



Type. Imperfect caudal pedicle and fin. 



[Form and proportions probably as in the type species.] Tuber- 

 culations of head and opercular bones frequently fused into short 

 ridges. Median fins well ornamented with tuberculations, those of 

 the anterior rays elongated. Scale ornament relatively fine, the 

 ridges sharp and irregular, rarely reticulating on the abdominal 

 flank-scales, but frequently so on the caudal ; ridges of principal 

 flank-scales often bifurcated, often with intercalations, finest, most 

 numerous, and most frequently interrupted towards the hinder 

 border ; ridges of caudal scales becoming gradually more branched 

 and reticulated towards the hinder extremity. 



Form, § Log. Upper Permian (Kupferschiefer) : Germany. Upper 

 Permian (Marl Slate) : Durham. 



P. 6299. Remains of head and abdominal region, with impressions 

 of the neural arches and traces of a series of small haemal 



