54 RAMSAY H. TRAQUAIR’S 
distantly articulated, and dichotomising towards their terminations; well- 
developed fulcra are observable along their anterior margins. Only a small 
part of the caudal fin is present in one example, the rays being similar in 
character to those of the dorsal and anal. 
Remarks.—This species is evidently very closely allied to the preceding, 
from which it may, however, be at once distinguished by the smoothness of 
the scales, and by the greater coarseness of the ornament on the cranial roof 
bones, which moreover always partakes more or less of a ridged character ; the 
suspensorium seems also slightly more vertical in its direction. Both species 
are referred only provisionally to the genus Canobius. 
Geological Position and Locality—Near Glencartholm, Eskdale, in the 
Cement-stone group of the Calciferous Sandstone series. 
Family PLATYSOMID/. 
(See Traquair, Trans. Roy. Soc. Edin. vol. xxix. 1880, p. 343.) 
Eurynotus, Agassiz, 1835, 
(Agassiz, Poiss, Foss, vol. il. pt. 2, p. 153.) 
Hurynotus crenatus, Agassiz. 
A scale indistinguishable from one of the flank scales of Eurynotus crenatus, 
so common a fish in the Calciferous Sandstone series of Edinburghshire and 
Fifeshire, occurs on a small portion of shale from Tweeden Burn, Liddisdale. 
Eurynotus (?) aprion, sp. nov. Traquair. 
PLY. ie, 20, 
Only a few disjointed scales. One of these, a typical flank scale, measures 
+ inch in height by somewhat less in breadth, and closely resembles, in general 
form, a flank scale of Lurynotus crenatus. The well-marked anterior and over- 
lapped area is very distinctly marked off from the posterior exposed one, which 
is rhomboidal, the acute angles being the posterior-superior and anterior-inferior ; 
the ornament consists of tranverse, sometimes oblique, furrows, which are deeply 
marked anteriorly, but fade away towards the middle of the scale, where they 
are replaced by scattered punctures; the posterior margin ts quite entire, and 
without any trace of serration or fimbrication. A similar character of ornament 
is displayed by smaller and more regularly rhomboidal scales, which evidently 
belonged to a part of the fish nearer the tail. 
