474 
ACTINOPTERYG-II. 
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 Pcilceoniscus 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 (Palaeont. 8oc. 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 merel} r to accidental 
crushing. It is labelled Pygopterus mandibular is, 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, 
