68 RAMSAY H. TRAQUAIR’S 
and head bones, as well as some patches of the scales themselves, intact. There 
is certainly no evidence either of the original absence of scales from the bare 
spaces in question, or of their removal by any mechanical process. 
Position and Locality —In the Cement-stone group of the Calciferous Sand- 
stone series, left bank of River Tweed, near Coldstream Bridge. 
Canobius obscurus, sp. nov. Traquair. 
Description.—Of this there are only a few fragmentary specimens, which 
indicate a fish of from 2 to 24 inches in length, and resembling, in shape, the 
other species which I have referred to this genus, being shortly fusiform, 
rather deep in front, tapering rapidly towards the tail, with a short blunt 
head, posteriorly placed dorsal fin, and inequilobate deeply cleft caudal. 
The head has its roof bones covered with fins and tolerably distant ridges, 
frequently interrupted, sometimes branched, and mainly running in a longitu- 
dinal direction, save on the ethmoid, where they are transverse. The rest of 
its osteology is very obscure, but the snout is bluntly rounded, and the suspen- 
sorium seems to be nearly vertical, or at least only slightly oblique ; the bones 
of the face, whose outlines cannot be made out, are apparently ornamented 
with ridges similar in character to those of the cranial roof. 
The scales, proportionally smaller than in the foregoing two species, are 
very regularly rhomboidal in shape, and are marked with from three to jive 
straight flattened ridges, which pass diagonally from above downwards and 
backwards, and terminate in prominent denticulations of the posterior margin. 
I have observed no row of specially large median scales between the head 
and the dorsal fin, but the dorsal margin is in no instance very well pre- 
served. 
One specimen, more perfect than the others, though the head is wanting, 
shows the dorsal and caudal fins. The former is placed far back, and would be 
nearly opposite the anal, were that fin preserved; it is short-based, triangular- 
acuminate, and composed of very delicate rays. The caudal is deeply cleft, 
and judging from its proportions was doubtless very inequilobate, though the 
extremity of the lower lobe and a considerable part of the upper one are lost. 
Remarks.—The comparatively coarse straight diagonal bars across the 
scales distinguish the species from all the others which I have brought under 
the genus Canobius. In general form it resembles the others, especially 
C. Ramsayi, but unfortunately very little is preserved of the structure of the 
head. 
Geological Position and Locality.—Blackadder Water near Dunse, Berwick- 
shire, in the Cement-stone group of the Calciferous Sandstone series. 
