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362 
CROSSOPTEEYGII. 
eulated; teeth compressed, with a sharp anterior and posterior 
edge. Ossified ring-shaped vertebrae in the abdominal region. 
Infraclavicle without an ascending process. Anterior dorsal fin 
opposed to the pelvic pair, and the posterior dorsal to the anal; 
tail diphycercal or slightly heterocercal, the caudal fin large and 
triangular, abruptly truncated or excavated posteriorly, the upper 
lobe nearly or quite as large as the lower, and the rays^ at the 
extremity of the caudal body-prolongation extending somkwSSt 
further backwards than the others, //A ) 
f o y%> t v 3 m '-s 
Eusthenopteron foordi, Whiteaves. 
1881. Eusthenopteron foordi, J. F. Whiteaves, Canadian Naturalist, n. s. 
vol. x. p. 31, woodc. 
1889. Eusthenopteron foordi, J. F. Whiteaves, Trans. Roy. Soc. Canada, 
vol. vi. sect. iv. p. 79, pi. v. fig. 5, pis. vi., vii., and woodc. fig. 1. 
1889. Phaneropleuron curium , J. F. Whiteaves {errore), ibid. p. 91, 
pi. x. fig. 1. 
1890. Eusthenopteron foordii, R. H. Traquair, Geol. Mag. [3] vol. vii. 
Type. Imperfect fish ; Geological Survey Museum, Ottawa. 
The type species, attaining a maximum length of not less than 
0*6. Head longer than deep, occupying somewhat more than one 
sixth of the total length ; the bones ornamented with granulations 
more or less fused into short tortuous rugee. Pelvic fins much 
smaller than the pectorals, arising about the middle point of the 
trunk, directly opposed to an anterior dorsal fin of nearly equal 
size ; anal and posterior dorsal fins relatively large, very high, 
narrow, and acuminate, equal and opposite, situated close to the 
base of the caudal fin; caudal fin about as long as deep, having the 
hinder border much excavated above and below the caudal body- 
prolongation. Scale-ornament very delicate. 
The fine state of preservation in which this species is discovered 
renders it possible to determine many points in the structure of the 
endoskeleton—notably the arrangement of the basal cartilages of 
the fins, which closely resemble those of Tristichopterus. A distinct- 
ring of sclerotic plates round the eye is also conspicuous in some of 
the type specimens. 
Form. Sf Loc. Upper Devonian: Scaumenac Bay, P. Q., Canada. 
P. 5219. Fish, 0-25 in length, with imperfectly preserved head, 
displaying all the fins except the pectorals. 
Presented by A. H. Foord,, Esq., 1886. 
