34 THE CANADIAN NATURALIST. [Vol. X. 



of each scale. Scales of the fins and tail rectangular and acutely 

 ribbed at their edges. In the central portions of the fins and 

 tail the scales are twice as long as broad, but near the outer 

 margins of the fins they become much narrower and more elonga- 

 ted. Dorsal fin single, triangular and placed very far backwards: 

 the base of its posterior ray nearly but not quite extending to 

 the commencement of the upper lobe of the tail. Tail hetero- 

 cereal, its upper lobe fringed by a row of backwardly directed, 

 flattened spines or "fulcral scales," which diminish in length 

 towards the posterior termination of the lobe. Ventral fins sit- 

 uated considerably in advance of the mid-length and separated 

 from the pectorals by a short interval. Anal fin placed much 

 farther forwards than the dorsal and separated from the ventrals 

 by a space slightly exceeding in length the height of the body at 

 the commencement of the anal. 



The above name is suggested provisionally for a species of 

 Cheirolepis, which resembles the C. macrocephalus of McCoy 

 and the G. Gummingice of Agassiz in the shape and sculpture of 

 the scales of its body and fins. The ventral fins of G. macro- 

 cephalus, however, are described by McCoy as " nearly central, 

 of moderate size, half their length distant from the anal," whereas 

 the ventrals of G. Ganadensis are placed much farther forwards 

 and are separated from the anal by a much longer space. The 

 ventrals of G. macrocephalus, too, are represented by McCoy as 

 being rather nearer to the anal than they are to the pectorals, 

 but those of G. Ganadensis are very much nearer to the pectorals 

 than they are to the anal. In G. Gummingice, according to Hugh 

 Miller, ''the large pectorals almost encroach on the ventrals, and 

 the ventrals on the anal fin" but this, as already stated, is by no 

 means the case with G. Ganadensis. The dorsal fin of G. Gan- 

 adensis, also, is placed much farther backwards than is that of 

 G. Gummingice, and the anal farther forwards. 



Of this species four fine and well preserved specimens were col- 

 lected by Mr. Foord, two of which are nearly perfect. 



Besides those already described, there are two or three species 

 of fossil fishes in Mr. Foord's collection, belonging to diff"erent 

 genera, also some isolated teeth and detached bones, whose affini- 

 ties have not yet been satisfactorily ascertained. 



The analogies between the fossil fauna of the fish-bearing beds 

 of Scaumenac Bay and that of the Old Red Sandstone of Scot- 

 land and Russia are very striking. The Ftcrichthys Ganadensis 



