34 
actinopterygii. 
Posterior suborbital plates radiately furrowed and their extent 
exceeding one third the length of the skull ; width of orbit much 
less than this measure; teeth of premaxilla not larger than those 
of ™ ‘ 086 ° f the Inan,libl0 somewhat the largest. Width 
length of the ff*" a PP aren % not exceeding one third the 
Form, cj- Loc. Turonian : S.E. England. 
yp specimen, a vertically crushed imperfect head, shown 
o two-thirds the natural size in PL V. fig. 1 ; L°"' er 
b-halk, Hollingbourn, Kent. The cranial roof is well 
exposed but damaged by an oblique fracture. Its most 
characteristic feature is the median depression in the 
Hinder frontal region, where the bone becomes com- 
paratively smooth. A traco of the small, finely-punctatc 
supraoccipital (s.occ.) is observed at the hinder border of 
the depress, on, while quite posteriorly on the left side an 
otic bone (apparently epiotic, ep.o.) i 8 crushed outwards. 
tVont IT?! 0 the Pari6tal 0»*), squamosal (*?■), 
,7" , ( / n) ° lemeDts can also ho distinguished ; the last- 
named being relatively large bones, exhibiting a series 
pits along either side of the depression where traversed 
nLetl rr a u al Th ° terminal ethmoid (eth.), GnelJ. 
Sed ^ supraoccipital, is relatively small and 
plates or," 1 ! T'li’ witllout an y expansion. The cheek- 
suborbhsT ^ W ” on the left s 'de, where the posterior 
consnicn * Wltb ‘bcir slightly radiating furrows are 
and it is ° U i ^ 8Utures between these are not distinct, 
cumorbitni° . qnil ; , ; clear whether there is a border of cir- 
of th. t h ( c ;°0 between them and the orbit. The anterior 
large an Jn above ‘be orbit is relatively 
single Inn atf T ’ Curvin e downwards in front to meet the 
There is al 80 narrow I' 1 ate hordering the orbit beneath. 
The maxilkY n \ 8ma11 trian e i,lar antorbital plate («•«•)■ 
displac!" 18 br ° ken in front by a fracture and 
Srr k v 1S0 «»— mandible. It is over- 
half to length by the suprama^ 
in its' an w!° h Uttle 0S P a nded behind. The teett 
in its ‘ R ' ° r half are only about half as large as thos« 
tri angular ^bo° r ^ P-maxiUa Q™, ) is a thir 
and bearing ; notched in its binder border 
front Dart oMi! ° S<3 Ser ^ es °* as small as those of th< 
Part of the maxilia. The mandible is also delict 
