u actinoptertqii. 
relatively narrow, their extent not exceeding one quarter the long* 
of the skull ; orhit very large, its width considerably greater than 
one third the length of the skull ; teeth of premaxilla relative y 
long and slender, larger than those both of the maxilla and dentary- 
percular apparatus relatively narrow, its width not exceeding ° ne 
third the length of the skull. Radiating lines on anterior scale* 
few and indistinct. 
Form. Sf Loc. Turonian : Sussex. 
49826. Type specimen, shown of the natural size from the left 
side in PI. VII. fig. 4; Lower Chalk, Lewes. The head 
is imperfect and a fracture crosses the rostral regi 011 
causing some displacement ; hut the general proportion 8 
seem to he determinable with sufficient accuracy. T e 
posterior suborbital plates (s.o.) are exhibited 
m an impression of their inner face, and it is uncertain 
how they were subdivided ; the transverse fractures may 
or may not represent sutures. There is one long i» fra ' 
orbital (i.o.) beneath the eye, and in the orbit ft se 
there is a trace of an ossified sclerotic (scl). The long, 
slender maxilla (m.r.), imperfect at each end, has a very 
slightly sinuous oral border hearing small spaced teeth. 
The premaxilla (pmse.), with a regular series of large* 
and more slender teeth, is about ono quarter as much 
extended as the maxilla. The mandible is imperfectly 
displaced, hut the anterior end of the dentary (<&) i )ea * 1 
slender teeth intermediate in size between those of ^ 
premaxilla and maxilla. The lower end of the I> r ®' 
operculum (p. op .) se ems to ho completely preserved, 
but is not much expanded and doeB not exhibit any 
ra lating ridges. The operculum (op.) is very imperl 0C > 
8 own ’ c hiefly as an impression, but must have beC 
nearly twice as deep as broad. The suboperculum ( s - n P‘ ! f 
is shown to have been smooth, with feeble traces o 
tv, a *'"" ^ Iles ’ an< f its width is about as great as its dop 
the slender clavicle (cl.) is partially exposed, while t 
post-temporal ( p.t .) and postelavicular plates (p-d-) aT 
con S pi cuous . A few of the anterior gcales ar e also pj* 
rved, the relatively small exposed area marked W> 
delicate radiating depressions. Capron C° l ’ 
