PALiEOXISCIDiE. 
431 
acuminate, nearly opposite, the former arising only slightly in 
advance of the latter; caudal fin deeply cleft, inequilobate. Scales 
sculptured, somewhat deeper than broad on the anterior portion of 
the flank ; a prominent series of dorsal ridge-scales. 
Except in the characters of the head, there is much superficial 
resemblance between this genus and Rhadiniehthys. 
Canobius ramsayi 9 Traquair. 
1881. Canobius ramsayi, R. H. Traquair, Trans. Roy. Soc. Edinb. 
vol. xxx. p. 47, pi. v. figs. 1-4. 
Type. Eish; Geological Survey of Scotland. 
The type species, attaining a maximum length of about 0*08. 
Maximum depth of trunk contained about three times in the 
total length. Head and opercular apparatus occupying little more 
than one-fifth of the total length; snout very obtusely rounded; 
external bones ornamented with coarse flattened corrugations, 
except the mandible, which is marked by finer and nearlv parallel 
longitudinal ridges. Pelvic fins relatively small, arising somewhat 
nearer to the anal than to the pectorals ; dorsal and anal fins 
similar, almost completely opposed; caudal fin very heterocercal, 
the upper lobe being about twice as long as the lower, and nearly 
equalling one-third of the entire length of the fish. Scales com¬ 
paratively smooth, rarely or never denticulated, but marked with 
few faint diagonal ridges and furrows, sometimes also with delicate 
vertical stnse close to and parallel with the anterior margin of the 
exposed area. 
Form. § Loc. Calciferous Sandstones (Cement-stone Group): 
Eskdale, Dumfriesshire. 
P. 4068. Three typical specimens, one being in counterpart. 
Purchased, 1883. 
P. 5981. Trunk with median fins, in counterpart. 
Purchased, 1889. 
Canobius elegantulus, Traquair. 
1881. Canobius elegantulus , R. H. Traquair, Trans. Rcy. Soc. Edinb. 
vol. xxx. p. 49, pi. v. figs. 5-8. 
Type. Eish ; Geological Survey of Scotland. 
General form and proportions as in the type species. Head and 
opercular bones ornamented with sharp, tortuous, and often 
