﻿474 ACTINOPTEKYGII. 



P. 3408 a. Portions of skull and mandible ; Midderidge. 



Enniskillen Coll. 



P. 838. Imperfect jaws, in counterpart ; Clarence Railway, Durham. 



Egerton Coll. 



36057. Imperfect caudal region with portions of fins; Midderidge. 

 Several of the features noted in no. P. 3416 a are also 

 shown in this specimen, but the dorsal scales beneath the 

 dorsal fin are as distinctly ornamented as those beyond. 



Purchased, 1861. 



28613. Middle portion of caudal region with dorsal and anal fins ; 

 Perry Hill. The head and anterior abdominal region of 

 a Palceoniscus are associated in such a manner as to 

 suggest its having been swallowed by the fish. 



Purchased, 1853. 



P. 838 a. Fragment of trunk ; "Whitley, Northumberland. 



Egerton Coll. 



The specimen mentioned below is described and figured as the 

 type of a distinct species, Pygopterus latus, Egerton, in W. King, 

 Permian Fossils (Palseont. Soc. 1850), p. 233, pi. xxiv. No other 

 example is known, and it seems probable that the proportions 

 different from those of the type species are due merely to accidental 

 crushing. It is labelled Pygopterus mandibidaris, in Agassiz's 

 handwriting. 



P. 552. Imperfect head and trunk, about 0-48 in length, much 

 crushed and wanting all the fins ; Marl Slate, Ferry Hill, 

 Durham. That the unusual depth of the trunk is due at 

 least to a considerable extent to crushing and distortion, 

 is proved by the great width of the space between the 

 neural and haemal arches in the caudal region, as also 

 between the neural arches and the supporting bones of 

 the dorsal fin. These bones are more numerous than 

 indicated in Mr. Dinkel's drawing, there being not less 

 than sixteen readily distinguishable elements in the series, 

 and they are scarcely so stout as represented. It is im- 

 possible to count the scales with certainty, and the slight 

 obliquity of some of the vertical series in the abdominal 

 region may be explained by distortion. Egerton Coll. 



A doubtful fossil from the Coal-Measures of Linton, Ohio, is 

 named Pygopterus scutellatus, J. S. Newberry, Proc. Acad, Nat, Sci, 



