SCALES OF SOME AUSTRALIAN FISUES.— COCKERELL. 
35 
THE SCALES OF SOME AUSTRALIAN FISHES. 
By T. D. a. Cockerell, University of Colorado. 
Through the continued efforts of Dr. R. Ilamlyn-Harris, I am now 
able to report on the scales of a number of additional Australian fishes, some of 
them of more than ordinary interest. As before, it appears that with rare 
exceptions the Southern species have scales closely resembling their Northern 
congeners, when such exist. Although scales are very variable in certain 
respects, their general characters are very constant, and persist w^hile other 
features of the fishes change, as for example in the Cheetodontidse mentioned 
below. Dr. Hamlyn-Harris informs me that not all the species discussed in my 
former contribution to these Memoirs (December, 1913) are from Queensland. 
Holocentrus angustifrons comes from New Britain; while PempJieris multira- 
‘d/iaius, Clieilodactylus nigricans, and Eupetriclithys angustipes are Southern 
■■species. 
ELOPIDiE. 
Megalops cyprinoides (Broussonet). Queensland. Scales 7-7^ mm. 
broad, 6-7 long; formed as in Tarpon atlanticus, with even more deeply 
scalloped basal margin; basal radii about 7; laterobasal angles rounded; 
nucleus above the middle; apical margin very thin, with very numerous 
evanescent radii, but the distinct apical radii arising from the nucleus are only 
one or two, extremely variable and irregular, often branching; there are also 
sometimes lateral radii, one on each side, which may branch, and there may 
be formed an approach to an irregular network, not well defined, but indi- 
cating a condition exhibited by some species of Barhtis. The circuli in the 
region above the nucleus are broken into minute tubercles; those below the 
nucleus are more or less evidently beaded. 
These scales are essentially as in Tarpon, differing by the small size and 
greater number of basal radii. The basal circuli are much more regular and 
less crowded than in Synodits, 
DOROSOMATID^. 
Dorosoma come Richardson. Queensland. Scales 5^-6 mm. broad, 5-5^ 
long; base with a bow-like (with double curve) outline; circuli very fine, 
wholly transverse; apical field very thin, wdthout circuli, no apical teeth; radii 
about 12, transverse, rarely branching. The radii are more or less bent or 
obtusely subangulate in the middle, but not at all interrupted. The median 
lateral circuli and radii reach the margin at right angles. 
