Or 
NI 
NEORHOMBOLHEPIS. Jk 
which at least ten are supported by the arched ceratohyal (ch.). The uppermost 
rays are ornamented and pectinated like the suboperculum; and only the three 
lowest rays in the fossil (possibly broken by flaking) are destitute of tubercles. 
The gular plate (fig. 46, gu.) is relatively very large and broad, widest behind, 
truncated in front, and richly ornamented with tubercles which are often fused 
into vermiculating ridges (fig. 4). 
There are no traces of vertebrz in the type specimen; but two thin and broad 
vertebral rings, of loose and fibrous texture, occur with a group of scales and a 
fin-ray obtained by the Earl of Enniskillen from Lewes (B. M. no. P. 4263). 
The pectoral arch is scarcely known, but there seems to have been a single 
pair of ornamented supratemporals, and a bone which may be supraclavicle 1s 
pectinated at the hinder border. A large postclavicular plate (fig. 4, pel.) 1s 
comparatively smooth, the reticulated ridge-ornament being very feeble. The 
pectoral fin-rays, of which the bases of seven in series, with three or four others 
further back, are seen in fig. 46 (pet.), are stout, closely pressed together, and 
ornamented with elongated tubercles. The rays of the much smaller pelvic fins 
(plv.), which are far forwards, are similarly stout and highly ornamented, but their 
enamel-tubercles are fused into vermiculating ridges of mainly oblique direction. 
There are no traces of fulera on the paired fins. The median fins are unknown. 
The scales are rhombic and deeply overlapping (fig. 5), with a low and broad 
vertical ridge on the inner face and a very feeble peg-and-socket articulation 
(fig. 47). They are scarcely ever deeper than broad, and in most of them the 
upper and lower borders are sigmoidally curved. So far as known, they are most 
Iighly ornamented between the pectoral fins, where they are covered with 
elongated enamel-tubercles, which are more or less fused into a network and 
terminate behind in coarse pectinations at the posterior border. All the scales 
are serrated or pectinated bebind, but there is every gradation between the 
extreme ornamentation of the outer face just described and a smoothness which 
is only interrupted by pittimgs. An ordinary scale, with feeble oblique wrinkles 
in front and elongated pittings and pectinations behind, is shown in fig. 5. 
Horizons and Localities.-—Turonian zones: neighbourhood of Lewes and 
Alfriston, Sussex; near Maidstone, Kent. 
Genus NEORHOMBOLEPIS, A. 8S. Woodward. 
Neorhombolepis, A. S. Woodward, Proc. Geol. Assoc., vol. x, 1888, p. 304. 
Generic Characters.—Trank elongate-fusiform, more or Jess laterally com- 
pressed, and head relatively large. External head-bones and the opercular bones 
stout, more or less ornamented with tubercles and ruge of enamel, but no pro- 
