46 RAMSAY H. TRAQUAIR’S 
Holurus fulcratus, sp. nov. Traquair. 
Pl. IIL. figs. 13, 14. 
Only one imperfect specimen of this form has been obtained showing the 
greater part of the body with the dorsal margin and dorsal fin, but deficient in 
the head, the ventral margin, and the fins, except the dorsal. 
Description.—Scales very similar in shape, proportions, and markings to 
those of Holurus Parki, but no denticulations are visible on the posterior 
margins even of the most anteriorly situated flank scales. A row of pointed 
imbricating azygos scales (fig. 14) extends along the middle line of the back, from 
the head to the dorsal fin, and these are much stronger and with fewer and 
coarser ridges than in Holurus Parki. At the commencement of the dorsal 
fin, these median scales pass into a few large and prominent fulcra placed 
along its anterior margin; the rest of the fin is conformed as in the pre- 
ceding species, extending, as in it, to the commencement of the tail pedicle, but 
the transverse articulations of the rays seem a little more distant. Anteriorly, 
the impressions of a few similar fulecra are seen adpressed to the body, as if 
they had belonged to the pectoral. 
Remarks.—The configuration of the scales and the position and shape of 
the dorsal fin clearly indicate this species as belonging to the same genus as 
Holurus Parki, which it also much resembles in general aspect. Specifically 
it is, however, at once distinguished by the great strength of the median dorsal 
scales, and by the large fulcra in front of the dorsal fin. 
Geological Position and Locality—Near Glencartholm, Eskdale, in the 
Cement-stone group of the Calciferous Sandstone series. 
Canobius, gen. nov. Traquair. 
Body shortly fusiform, rapidly tapering towards the tail; caudal fin very 
heterocercal, deeply cleft, inequilobate, the upper lobe elongated ; dorsal and 
anal fins short-based, triangular-acuminate, nearly opposite each other, the 
former commencing only very slightly in front of the latter; pectorals and 
ventrals obscure. Suspensorium nearly vertical; snout rounded, slightly pro- 
jecting over the mouth; orbit large, gape small or moderate; dentition un- 
known. Scales rhomboidal, in some cases a row of large imbricating scales 
between the occiput and the origin of the dorsal fin. 
I propose to institute the new genus Canobiws for the remarkable little 
fish Canobius Ramsayi, Traq., from the Eskdale beds, a form which to the 
general configuration of a Palzeoniscid, unites a disposition of the suspensorial 
and opercular apparatus, which is almost identical with the condition of these 
parts in the Platysomid Hurynotus. Here again we have a fish which contra- 
dicts what I once considered an essential character of the Paleoniscide, namely, 
