.194 
ACTIXOPTERYGII. 
as long as its maximum depth, ornamented with conspicuous 
tubercles, of which the large majority are not placed on ridges , 
more than six enlarged mandibular teeth. Teeth much compressed, 
sometimes with very delicate striations but not serrated. 
Fo>-m. $ Loc. Turonian (?) : Kent and Sussex. 
P. 1703. The type specimen, shown of the natural size in Pi- 
fig. 2 ; Chalk, Kent. Only part of the left lateral border 
of the cranium is shown above the orbit and otic region, 
and exhibits the usual ornament of tubercles on ridges. 
A fragment of the parasphenoid, the left hyomandibular 
(ftm.), and left metapterygoid, are exposed, but too 
imperfect for description. The fractured remains of tie 
left premaxilla (pmx:), with its characteristic ornament, 
obscure the palatine and part of the ectopterygoid (eept-h 
but most of the teeth of these inner elements are shown- 
The palatine tooth (pal.) is much the largest and exhibits 
very feeble traces of longitudinal striation. dh° e 
mandibular ramus is well-displayed, though impe 
rfect 
anteriorly and a little fractured behind. The upper part 
of the dentary ( d .) is flattened on the outer face an 
ornamented by tubercles with no definite arrange me 
while in its lower portion a few tuberculated ri g 
radiate from the symphysis backwards and downwa _» 
the precise boundary of the articulo-angular (ag-)* w 
is similarly ornamented, is not clear. The mandi ^ 
teeth are straight and more slender than those o ^ 
palato-pterygoid arcade. The deep and narrow tu 
culated preoperculum ( p-op.) is partly shown, an e 
are traces of a small reflection at its lower end wbic .y.”| n(r 
have been a short spine. Tho operculum (op .), exbl 1 
numerous radiating lines of small tubercles, is or e 
most part beautifully preserved ; and the equally . 
suboperculum ( g.op .), with rows of tubercles c i 
is also 
represented by a 
Egerton 
large 
Coll- 
directed downwards 
fragment. 
■P. 5416. Remains of another head in a small block of cbft ^ s0C- 
left palato-pterygoid arcade figured in Proc. Geo . . 
TT/O _ l ■ r> ' n T imnertcct ri © 
vol. X. pi. i. fig. 6 ; Chalk, Lewes. The impel 
uch 
premaxilla exhibits the characteristic ornamentation^^ 
abraded, bears very slender well-spaced teeth* a ^ 
shown of the natural size in PI. XI. fig- 3- as pect, 
palato-pterygoid arcade is exposed from the inner 
