17 
PhoUdopltorus. Tlie close marginal scries of minute teeth in the upper jaw 
is distinctly seen in the type-specimen. There appear to he siipramaxillary 
hones corresponding Avith those of PhoUdophoriis and LcptolcpU ; and in the 
suhorhital ring there is one very distinct large cheek-plate covering all the 
space between the orlht and preoperculum. The latter hone is narrow and 
arcuate, apparently not exposed in its upper portion ; the operculum is 
{[uadrate and much deeper than broad, while the suhoperculum is scarcely 
half as deep as this element, separated from it l)y a somcAvhat ohlicpie suture, 
and exhibiting a short ascending process at its antero-superior angle ; the 
interoperculum is relatively small and triangular. Beneatii the suhoperculum 
there follows a scries of about eight branchiostegal rays, all l)road, but the fore- 
most about as broad as long ; and in one specimen on the slab No. h, the large 
gular plate is conspicuous between the anterior half of the rami of the niandi])le. 
Axial Skeleton of Trunk . — There is no satisfactory evidence of ossifi- 
cations in the notochordal sheath, but the neural and htemal arches AA’ere all 
calcified, at least superficially. The long, slender ribs of the abdominal 
region are sliown in all the specimens, apparently not quite reaching the 
ventral margin ; hut the series is not sufficiently comj)lctc to be counted. 
The neural and liLumal arches are shorter and stouter in tlie caudal region 
(PI. II, Pig. 6), and almost symmetrically arranged Avith respect to the 
notochord as far as the base of the caudal fin, Avherc the luemals (h) become 
cousidcraldy enlarged, as usual, for the direct su]>port of the lin-rays (r). 
There are no traces of intermuscular bones. 
Appendicular Skeleton. — The crushed supratemjAoral and post-tem- 
poral plates are always shown above the operculum (PI. II, Pig. 5), and it is 
clear that there are some post-claAucular scales behind the sickle-shaped 
clavicle. Nothing Avorthy of note, hoAA^ever, is shown in the pectoral arch, 
and not in any specimen are there distinct remains of the pelvic arch. All 
the fin-rays are robust and midividod for a considerable length proximally, 
and none are closely articulated or Infurcate more than tAvice distally. The 
fulcra are very slender and minute, and are distinctly seen on the front margin 
of the pectoral fin in the slender specimen on slab No. b. So far as can be 
ascertained, the pectoral fin comprises from ten to tAvelve rays, Avhile the 
pelvic fin has only about half that number ; the dorsal fin comprises ten, and 
the anal fin not less than fourteen rays. 
Squamation. — The scales are remarkably uniform in character, thin, 
deeply imbricating, and almost cycloidal, exhibiting only the concentric lines 
