PALiEONISCIDiE. 
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. Mans- 
feld. p. 13. 
1839. Palceoniscus megacephalus , G. A. Kurtze, ibid. p. 17. 
1840. Palceoniscus magnus, E. F. Germar, Yerstein. Mansfeld. Kupfer- 
scliief. p. 18. 
1850. Palceoniscus megacephalus = P. freieslebeni, Sir P. Egerton, 
Quart. Jourm Geol. Soc. vol. vi. p. 6. 
1861. Palceoniscus magnus , II. 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.$ Loc. Upper Permian (Kupferschiefer): Thuringia, Hesse, 
and Hanover. 
P. 3474. Young individual, 0-195 in length; Eiechelsdorf, Hesse. 
Enniskillen Coll. 
28425. Portion of trunk; Eiechelsdorf. Mantell Coll. 
P. 1015. Typical specimen, wanting the greater part of the head 
and the extremity of the tail, labelled by Agassiz ; Eie¬ 
chelsdorf. Egerton Coll . 
P. 3423-24. Imperfect trunk, and a much crushed and distorted 
fish in counterpart; Eiechelsdorf. Enniskillen 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 the head and parts of the trunk ; 
Eisleben, Saxony. Enniskillen Coll. 
2 i 
PART II. 
