SEMIOXOTIDJE. 
155 
much less deep than the suboperculum, the preoperculum narrow 
and almost covered by the suborbitals ; the external hones more or 
less ornamented with superficial tuberculations of ganoine. Mar¬ 
ginal teeth styliform, in close regular series. Fin-fulcra large and 
uniserial. Pectoral fins large, situated well upon the flank, pelvic 
fins smaller; dorsal and anal fins remote and opposite, not much 
elongated ; caudal fin forked. Scales quadrangular, robust, very 
deep on the flank, more or less tuberculated, and the anterior border 
strengthened by a robust inner rib, which forms the peg-and-socket 
articulation; the series between the dorsal and anal fins sharply 
turned forwards for a short space above and below; dorsal and 
ventral ridge-scales conspicuous. 
Cleithrolepis granulatus, Egerton. 
1864. Cleithrolepis granulatus , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. xx. p. 3, pi. i. figs. 2, 3. 
1890. Cleithrolepis granulatus, A. S. Woodward, Mem. Geol. Surv. 
N. S. Wales, Pakeont. no. 4, p. 39, pi. vii., pi. viii. figs. 2, 3. 
1890. Cleithrolepis granulatus, O. Feistmantel, ibid. no. 3, p. 75, pi. xxix. 
fig. 8. 
Type. Nearly complete fish. 
The type species, attaining a length of about 0T5. Maximum 
depth of trunk about equal to its length (exclusive of the caudal 
fin) and somewhat more than four times as great as the depth of 
the caudal pedicle. Head with opercular apparatus occupying less 
than one-fifth of the total length of the fish, and its height at the 
anterior margin of the operculum contained slightly more than 
two-and-a-half times in the maximum depth of the trunk; depth 
of operculum only half that of the suboperculum, which is twice as 
deep as broad. External bones and scales finely and closely tuber¬ 
culated. Pelvic fins arising midway between the pectoral and anal 
fins; dorsal fin, with about 17 rays, arising at the commencement 
of the posterior third of the trunk ; anal fin arising more posteriorly 
but terminating at the same point, and comprising not more than 
12 rays. Flank-scales very deep, some of those of the lateral line 
five or six times as deep as broad, none serrated on the hinder 
border; the vertical series on the caudal region rapidly narrowed; 
ridge-scales apparently not crenuiated. 
Each ventral ridge-scale is shown in several specimens to consist 
of a right and left half, apparently meeting at a very obtuse angle 
in the median line: and it is thus evident that the lower portion of 
the abdomen was broad during life. The fish is, indeed, of so 
remarkable a form that the fossilized examples are very variously 
