146)» =Dr. R. H. Traquair—Devonian Fishes from Canada. 
same beds. I therefore doubt its being even referable to the family 
Pleuracanthidee. 
? Cheiracanthus costellatus, sp. nov. 
Several detached spines and one fish wanting the head constitute 
the remains of this interesting species, which are contained in the 
present collection. ; 
The fish measures four inches in length, but it is so distorted and 
shortened up that its real dimensions and contour cannot be deter- 
mined. Six spines are shown, which I interpret as two pectoral, 
two ventral, one dorsal, and one anal. The spines are large and 
rather slender; the pectoral measuring 12 inch in length and 4 inch 
in breadth about the middle, the dorsal 24inches. The others are 
imperfect, but all are remarkably straight save the pectoral, which 
is gently curved. The exposed surface of the spines is marked by 
prominent longitudinal ridges and furrows, there being four to six 
on each side, while the median one along the anterior aspect of the 
spine is broader than the others. There are two clavicular elements 
near the pectoral spines which resemble in form rather more those 
of Cheiracanthus than of Acanthodes. The scales are marked on their 
exposed surfaces with extremely fine striae, which are only visible 
under a strong lens, and pass longitudinally across the scale in a 
direction parallel to the diagonal, connecting the anterior and 
posterior angles. 
On first seeing the spines I thought of Whiteaves’s Homacanthus 
gracilis from the same beds; but they are more slender and have less 
of a “conical” shape than the spine figured by that author; besides 
which there are no signs of posterior denticles. It is unfortunate 
that the fish is so distorted that the relative position of the spines, 
and especially of the dorsal, with regard to the anal is obscured, so 
that its reference to Cheiracanthus must of course be considered as 
merely provisional ; indeed against this reference may be mentioned 
the fact that, in their strongly fluted character, the spines rather 
deviate from those of the well known Scottish species Ch. Murchisont 
and Ch. latus. 
Cephalaspis Campbelltownensis, Whiteaves. 
Whiteaves, Canadian Nat. n.s. vol. x. p. 98; and Trans. Roy. Soc. Canada, vol. vi. 
sect. iv. p. 92, pl. x. fig. 
In my former paper I recognized two distinct species of Cephalaspis 
from the Campbelltown beds, one having the cephalic shield rounded 
in front, the other in which it assumed a pointed form like the snout 
of askate. Mislead by Mr. Whiteaves’s figure, I referred the former 
to his C. Campbelltownensis ; to the latter I attached the name of 
C. Whiteavesi. 
Mr. Smith Woodward having had subsequently the privilege of 
inspecting the original type of C. Campbelltownensis, found that it 
actually possessed the pointed rostrum characteristic of my OC. 
Whiteavesi, which rostrum had been omitted in the drawing pub- 
lished by Mr. Whiteaves.’ Consequently. my species had to go, 
1 A. S. Woodward, Cat. Foss. Fishes Brit. Mus. pt. ii. p. 191. 
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