110 
ACTINOPTERYGII. 
pterygoid are partly exposed, and the preoperculum 
appears to owe its peculiar form to crushing and fracture. 
The operculum and suboperculum are also much broken, 
hut their true proportions seem to be as described by 
Agassiz. The uppermost postclavicular scale is con¬ 
spicuous, and there are traces of the elongated basal bones, 
besides the coracoid, at the origin of the pectoral fin. The 
fulcra on the latter are distinctly biserial, and the fin-rays 
are undivided except quite at the extremity. The 
obliquely-ridged structure of the scales can be faintly 
seen through the enamel, which is well preserved. 
ManteTl Coll. 
P. 6337. A fine specimen, originally about 0*9 in length, wanting 
the extremity of the snout and the pectoral fins, but 
displaying part of the base of each of the other fins ; 
Hastings. The opercular and head-bones are coarsely 
tuberculated as in the type specimen, and the operculum 
is nearly similar in proportions ; but the preoperculum is 
shaped as in the so-called L. Jittoni, and the suboperculum 
seems to have been nearly half as deep as the operculum. 
The pelvic fins arise considerably nearer to the position of 
the pectoral arch than to the anal, and both these fins 
display large fulcra; of the dorsal and caudal fins only 
insignificant fragments remain. The dorsal part of the 
abdominal region is crushed and displaced, but the greater 
part of the squamation is undisturbed, and the principal 
fiank-scales exhibit a feeble pectination. BecMes Coll. 
P. 6336. Another fine specimen, equally large, wanting the paired 
fins but displaying the greater part of the anal and caudal; 
Hastings. The operculum is as described in L. Jittoni, 
but whether or not its comparative smoothness is due to 
abrasion, is uncertain ; the cranial and facial bones are 
irregularly rugose, not exhibiting sharp tuberculations. 
The dorsal fin is shown to have arisen at about the middle 
point of the back, but only the large anterior fulcra and 
two fragments of rays are preserved; the anal fin, with 
numerous more slender fulcra, seems to have been deeper 
than long; and the robust caudal fin-rays are shown to 
have been very closely articulated quite to their base. All 
the scales are smooth, but those on the anterior portion of 
the flank exhibit serrations, and each scale of the lateral 
line is conspicuously notched. The perforations of the 
