Devonian Fishes of Campbelltown and Scaumenac Bay. 113 
spines are large and rather slender, the pectoral measuring 
13 inch in length, and 4 inch in breadth about the middle, 
the dorsal 2} inches. 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 striz, 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 Homa- 
canthus 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. Murchisoni and Ch. latus. 
Cephalaspis Campbelltownensis, Whiteaves. 
Whiteaves, Canadian Nat., N.S., vol. x., p. 98; and Trans. Roy. Soe. 
Canada, vol. vi., sec. iv., p. 92, pl. x., fig. 
In a former paper! I recognised 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 a skate. Misled 
by Mr Whiteaves’s figure, I referred the former to his 
1 Geol, Mag. (3), vol. vii., 1890, pp. 15-22. 
VOL. XII. H 
