[LAMBE] GANOID FISHES FROM NEAR BANFF, ALBERTA 43 
plate III, figure 1, which measures 2% inches in length and slightly 
over an inch in maximum depth, the fins are not preserved, and the 
head and tail are wanting. The scales, however, are in place and are 
well preserved showing details of sculpture. The specimen was col- 
lected on the 21st of July, 1915, by Mr. J. A. McLennan, field assistant 
to Dr. E. M. Kindle, on the trail to Johnson creek, at a point about 
two miles east of Castle Mountain station. 
The rock in which the specimen occurs is a very fine, calcareous 
sandstone having a dark grey colour in a fresh fracture but decidedly 
brownish when weathered. The specimen as it now is, is partly 
on one and partly on the other of the two surfaces produced by split- 
ting the rock along the plane in which the specimen lies. The greater 
part of the upper half of the trunk has adhered to one of the rock 
surfaces, the larger of the two (Cat. No. 755) exposing the outer side 
of the upper right scales from far forward on the flank to near the 
tail. Here the entire irregular outline of the specimen is seen, as well 
as clear impressions in the rock of the outer surface of the lower scales 
of the left side of the trunk. Most of the lower half of the trunk 
has come away on the other cleavage surface of the rock (Cat. No. 
755a) exposing to view the outer surface of the lower scales of the 
left side, the scales of which the impressions, just mentioned, are so 
clearly preserved. 
This fish was a small one, probably about 6 inches in length 
or less. As the head is missing and the tail and fins are not preserved 
it is necessary to rely entirely for its generic determination on the 
characters supplied by the scales, plate III, figures 2, 3 and 4. Fortu- 
nately these scales are well preserved; their outer sculptured surface 
is seen to advantage throughout the greater part of the trunk, while 
a few scattered scales give full information regarding the inner surface. 
What appear to be two or three fragments of fin rays occur with the 
scattered scales but they are rather obscurely preserved and _ fail 
to give details of structure. 
The combination of characters displayed by the scales suggest 
the propriety of referring this fish to the Palæoniscid genus Acrolepis 
of Agassiz. For the species the provisional name l@tus is proposed 
pending the discovery of more complete material. 
The scales are small with a well developed peg and socket artic- 
ulation and a considerable overlap which, in the anterior flank scales, 
is slightly over 1/5 of the length (antero-posterior) of the scale. 
Anteriorly on the flank the exposed or sculptured part of the scales, 
which is lozenge shaped, is somewhat higher than long. Following 
backward toward the tail the scales decrease slightly in size and also 
in proportionate height. A decrease in height is also noticed inthe 
