369 
OSTEOLEPTDiE* 
1-10, 15-21, pi. v. figs. 1-11 (probably in part Thursius macrolepi- 
dotus). 
1888. Osteolepis macrolepidotus , R. H. Traquair, Geol. Mag. [3] vol. v. 
p. 515. 
1890. Osteolepis macrolepidotus, R. H. Traquair, Ann. Mag. Nat. Hist. 
[6] vol. vi. p. 484. 
Type. Imperfect fishes : oZim T. S. Traill Collection. p O ^ 
The type species, attaining a maximum length of about 0*3. 
Head with opercular apparatus contained about four and a half 
times in the total length; parietal region about two thirds as long 
as the fronto-ethmoidal; jaws much elongated. Pelvic fins situated 
about halfway between the hinder margin of the operculum and 
the extremity of the tail; dorsal fins higher than long, separated 
by an interspace equal to twice the length of the base of the second 
dorsal, which is somewhat larger than the first dorsal and similar 
to the anal. Scales large. 
Form. Sf Log. lower Old Red Sandstone : Orkney, Caithness, 
Ross-shire, Cromarty, Nairnshire, and Banffshire 1 . 
(i.) Orkney Isles (typical 0 . macrolepidotus). 
P. 817. Small fish, 017 in length, showing the fins; Belyacreugh. 
Egerton Coll. 
P. 3300-1. Three similar specimens, the third exhibiting small, 
slender, well-spaced teeth in the mandible. 
Enniskillen Coll. 
P. 4604, P. 4606. Four imperfect specimens, one wanting the tail. 
Enniskillen Coll. 
41136. Specimen displaying the large scales of the abdominal 
region. Purchased , 1868. 
39195-86. Fish equal in size to the preceding, exhibiting the 
ventral aspect, and a smaller, very imperfect specimen, 
lateral aspect; Skaill. Purchased , 1865. 
36185. Small fish, showing fins, mostly obscure. Purchased , 1861. 
39353. Small crushed specimen (0. brevis , M‘Coy) ; Stromness. 
Purchased , 1865. 
36182-83. Similar fish, obscurely preserved, in counterpart. 
Purchased, 1861. 
1 Scales from the Devonian of St. Petersburg are doubtfully referred to the 
so-called 0. major by Agassiz, Poiss. Foss. V. Gf. R. (1845), p. 138, pi. xxviii. a. 
fig. A, pi. sxxi. a, figs. 8-13. Other fragments of bones and scales from the 
Devonian of Russia are also ascribed to this species by E. von Eichwald, Leth, 
Rossica, vol. i. (1860), p. 1552. 
PAST II. 
2b 
