544 
ACTINOPTEitYGll. 
in the relative proportions of the head between the Kupferschiefer 
fossils and those named striatus from the English Marl Slate ; and 
in all these fishes the scale-ornament- is identical. The rounded 
form of the dorsal and ventral margins in the so-called P. rhombus 
is due to accident in preservation, the median fins being almost or 
completely destroyed in fishes exhibiting this contour. 
Form. Sf Log. Upper Permian (Kupferschiefer) : Germany. Upper 
Permian (Lower Magnesian Limestone and Marl Slate): Durham 
and Northumberland. 
(i.) Kupferschiefer. 
44864. Pish of moderate size, in counterpart, wanting the ventral 
border of the abdominal region and the greater part of 
the dorsal and anal fins : Mansfeld, Thuringia. Parts of 
the endoskeleton of the trunk are well shown, the distal 
series of short baseosts in the anal fin being conspicuous, 
and the proximal series of dorsal fin-supports (axonosts) 
extending forwards as far as the occiput. 
Presented by Benjamin Bright, Esq., 1873. 
35530. Small fish, 0-145 in length, nearly complete, but wanting 
the pelvic fins; Piechelsdorf, Hesse. Purchased, 1859. 
43431. Imperfect small specimen, wanting the lower jaw and fins ; 
Piechelsdorf. The form of the cranium, lateral aspect, 
is well shown, and there is a series of stvliform teeth in 
the upper jaw. 
Presented by Kenneth Murchison, Esq., 1872. 
43430. More imperfect larger specimen ; Piechelsdorf. 
Presented by Kenneth Murchison, Esq., 1872. 
P. 1601. Fine small specimen, about 0*095 in length • Piechelsdorf. 
Eger ton Coll . 
P. 1599. Head and trunk, 0*16 in length, wanting caudal lobe and 
fin ; Piechelsdorf. Egerton Coll. 
P. 3496-7. Four imperfect specimens, one displaying the pectoral, 
pelvic, and dorsal fins, and another exhibiting one of the 
pectoral fins ; Piechelsdorf. Enniskillen Coll. 
18513. Large specimen displaying portions of the scale-ornament 
in impression ; Eisleben, Saxony. Purchased, 1844. 
28279. Large head and trunk, showing parts of the endoskeleton 
of the trunk, and the pelvic, dorsal, and anal fins ; 
Eisleben. Purchased, 1853. 
