1883.] the Devonian Rocks of Canada. 161 
teeth, each furnished with rows of conical denticles, These pala- 
tal teeth are precisely like those of Dipterus as figured by Hugh 
Miller in the “Footprints of the Creator,” and the affinities of 
Phaneropleuron with the living Ceratodus and with the Dipnoi 
generally are thus rendered still more apparent. 
Eusthenopteron Foordi—In the same paper as that in which the 
preceding species was described, the above provisional name was 
suggested for a number of large fragments of a fish, which, when 
perfect, must have attained to a length of fully three feet. The 
largest specimen consists of a portion of the posterior end of the 
fish about a foot in length, which shows the external characters 
tolerably well, though the caudal, anal and second dorsal fins are 
imperfect. The bony supports of each of these fins and about five 
inches of the vertebral column, or rather of its lateral elements, 
are beautifully preserved in another specimen. The only parts of 
e head then recognized were fragments of a dentary bone, with 
teeth, and some isolated cranial plates, ne of which is evidently 
the operculum. ; 
In the sculpture of the cranial plates, in the shape and orna- 
mentation of the scales of the body, and in the fact that the fin 
rays of the second dorsal and anal are both supported by three 
osselets articulated to a broadly dilated spinous apophysis, this 
supposed new genus very closely resembles the Tristichopterus of 
Sir Philip Egerton. But it is well known that in many Devonian 
fishes the notochord was persistent, and Sir P. Egerton calls spe- 
cial attention to the fact that Tristichopterus is an exception to 
this rule, its vertebral centers being completely ossified. Further, 
-the osselets of tke lower lobe of the tail of Tristichopterus are de- 
scribed as “ springing from eight or nine interspinous bones.” In 
* Eusthenopteron, on the other hand, the vertebral centers do not 
appear to have been ossified at all, and the osselets of the lower. 
lobe of the tail are articulated to the swollen outer extremities of 
the heemal spines. 
More recently, in 1871, a number of additional specimens of 
Eusthenopteron have been collected by Mr. Foord, which throw 
. ch new light on its structure. Small specimens show that the 
peculiar central and accessory lobe developed between the upper 
and lower lobes of the tail, which suggested to Sir P. Egerton the 
name Tristichopterus, is common to that genus and to Eusthe- 
feron.: The general shape and position of the fins, too, ap- 
