MANSFIELD DISTRICT, VICTORIA. 
General Form.—As shown by the type-specimen and the 
original of Pl. IX, fig. 4, the deepest part of the trunk of this 
species is at the origin of the dorsal fin, which is remarkably 
large and extended. The other specimens are more imperfect or 
distorted during fossilisation. 
Head.—The small head is partly indicated in the type- 
specimen, but better shown in another impression (Pl. XT, fig. 3). 
The fine ornament on at least the frontal region of the cranial 
roof is partly subdivided into tubercles. The other external 
bones are only striated, the striae on the maxilla and mandible 
being mainly horizontal or longitudinal, those on the cireum- 
orbital plates (Pl. XI, fig. 3b) radiating. The maxilla bears 
large, stout teeth, and its postorbital expansion is about two-and- 
a-half times as long as deep. The opercular apparatus must have 
been very narrow. 
Appendicular Skeleton.—The supraclavicle, clavicle and infra- 
clavicle, seen in the type-specimen (Pl. XI, fig. 1), are moder- 
ately wide plates, ornamented with fine ridges or striations 
disposed in the direction of the long axis of these bones. The 
length of the pectoral fins can scarcely have exceeded half that 
of the head with opercular apparatus. The pelvic fins seem to 
have been as large as the pectoral pair. ‘Che dorsal and anal fins 
are remarkably large and extended, the former arising at the 
highest point of the back and always depressed backwards in the 
fossils. More than 40 rays are indicated in the imperfect dorsal 
fin of the type-specimen, and more than 30 rays are seen in the 
anal fin in the original of Pl. IX, fig. 4. The articulations of all 
the fin-rays are distant. 
Scales.—The slight deepening of the principal scales of the 
flank in the abdominal region is observable both in the type 
(Pl. XI, fig. 1a) and in other specimens. The finely-striate 
ornamentation of the scales resembles that already described in 
Elonichthys sweeti, but there is never an indication of median 
smoothness. 
[23] 
