52 RAMSAY H. TRAQUAIR’S 
vertical ridges close to and parallel with the anterior margin, which then turn 
round below and run backwards parallel with the inferior one ; the rest of the 
area is occupied with ridges parallel with the superior and inferior margins, but 
of course directed against the vertical portions of the first-mentioned set. 
Some amount of wavyness is frequently observed in these ridges, and where 
they come to the posterior margin of the scale they end on sbarp denticula- 
tions. On other parts of the body, such as the back, belly, and tail, the ridges 
tend to pass into one set which traverse the scales somewhat diagonally from 
before backwards. 
I have not observed either the pectoral or ventral fins. The dorsal and 
anal are nearly opposite each other, the former come only an almost inappreci- 
able distance in advance of the latter; both fins are well developed, short-based, 
triangular-acuminate, composed of tolerably stout smooth rays, which dichoto- 
mise towards their extremities, and are divided by moderately distant articula- 
tions. The caudal is deeply cleft, very heterocercal and equilobate, the upper 
lobe appearing produced; its rays are similar in character to those of the dorsal 
and anal. Very distinct fulcra are observable along the anterior margins of all 
the fins. 
Several examples have occurred of what seems to me to be only a variety of 
the above described form, the only appreciable difference being in the more 
delicate markings on the scales. 
Remarks—I know of no previously described fish with which the present 
species can be confounded. In general contour it resembles Canobius 
Ramsayi and Canobius elegantulus, but it may be at once distinguished from 
both by its scale-markings as well as by the more typically paleeoniscoid con- 
figuration of its facial bones. In the configuration of the opercular bones and 
the direction of the suspensorium, a condition is presented which is somewhat 
intermediate between that in Canobius Ramsayi and in ordinary Paleonis- 
cide, and which, as I have already mentioned, at first nearly induced me to 
institute a separate genus for this and the following species, but considering 
that so much still remains to be learned concerning the more minute characters 
of these small fishes, it is perhaps better to avoid premature multiplication 
of genera by including them provisionally in Canobius, to which they certainly 
bear a greater general resemblance than to any other genus. 
Geological Position and Locality—Near Glencartholm, Eskdale, in the 
Cement-stone group of the Calciferous Sandstone series. 
