﻿PAL2EON1SCIDJ3. 481 



1834. Palceoniscus magnus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 78, 



pis. xiii., xiv. 

 1839. Palceoniscus magnus, G. A. Kurtze, Comment. Petrefact. Mtins- 



feld. p. 13. 



1839. Palceoniscus megacephalus, G. A. Kurtze, ibid. p. 17. 



1840. Palceoniscus magnus, E. F. Germar, Verstein. Mansfeld. Kupfer- 

 schief. p. 18. 



1850. Palceoniscus megacephalus = P. freieslebeni, Sir P. Egerton, 



Quart. Journ. Geol. Soc. vol. vi. p. 6. 

 1861. Palceoniscus magnus, H. B. Geinitz, Dyas, p. 16. 



Type. Nearly complete fishes ; Paris Museum of Natural History. 



A very large species, attaining a maximum length of about 0*4. 

 Trunk regularly fusiform and the back somewhat arched in advance 

 of the dorsal fin ; greatest depth contained about four and a half 

 times in the total length. Head and opercular apparatus occupying 

 more than one-fifth of the total length ; cranial bones marked with 

 coarse, closely arranged, vermiculating rugae and elongated tubercles 

 of ganoine. Fin-rays broad, covered with ganoine, and ornamented 

 as the scales ; proportions and arrangement of fins as in P. frei- 

 eslebeni. Scales relatively larger than in the last-named species, with 

 fewer grooves and pittings. 



Form, fy Loc. Upper Permian (Kupferschiefer) : Thuringia, Hesse, 

 and Hanover. 



P. 3474. Young individual, 0*195 in length; Biechelsdorf, Hesse. 



Ennishillen Coll. 



28425. Portion of trunk : Biechelsdorf. Mantell Coll. 



P. 1015. Typical specimen, wanting the greater part of the head 

 and the extremity of the tail, labelled by Agassiz ; Bie- 

 chelsdorf . Egerton Coll. 



P. 3423-24. Imperfect trunk, and a much crushed and distorted 

 fish in counterpart ; Biechelsdorf. Ennishillen Coll. 



15405. Imperfect trunk, with portions of fins; Mansfeld, Thu- 

 ringia. Purchased, 1840. 



18506. Imperfect head and greater portion of trunk; Mansfeld. 



Purchased, 1844. 



P. 1014. Two fishes wanting the extremity of the tail, and three 

 more imperfect specimens ; Eisleben (Saxony) and 

 Mansfeld. Egerton Coll. 



P. 3423 a. Two specimens showing tbe head and parts of the trunk ; 

 Eisleben, Saxony. Ennishillen Coll . 



PART II. 2 I 



