SCOPELID^. 
2(51 
the posterior tooth, and the length of the latter equalling the inter¬ 
space between the two teeth, also about half the length of the part 
of the premaxilla in front of its insertion. Maximum depth of 
mandible equalling about one fifth of its length; dentition occupy¬ 
ing half its length, with two relatively large teeth of about equEil 
size in the middle of the series, with small broad teeth behind, and 
still smaller recurved teeth in front. Large teeth much laterally 
compressed, and marked with very fine vertical striations in the 
basal portion. 
The name striatus is given to this species, because it seems 
probable that the indeterminable fragment of jaw described by 
Agassiz as Saurocephalus striatus is the hinder part of a large pre¬ 
maxilla of the same form. 
Form. Log. Turonian : S.E. England. 
49821. The type specimen, a small skull and mandible, partly 
broken and distorted, shown from both sides and from 
above in PI. XIV. figs. 1, In, 16; Lower Chalk, 
Southeram Pit, Lewes. The head is shown to have been 
long and laterally compressed, with a very acute snout ; 
but the cranium is crushed downwards in the fossil and 
broken in a sharp transverse fracture at about its middle. 
The frontal bones (/r.) are very extensive, almost reaching 
the occipital border; and their inner half is remarkably 
smooth, marked only by radiating lines of growth. Im¬ 
mediately behind them the stout supraoccipital bone 
(s.occ.) is seen, distinctly separating the parietals, but 
not exhibiting any median crest or keel. The bones of 
the cheek are almost completely destroyed, but the cha¬ 
racteristic anterior portion of the premaxilla (pmx.) is 
indicated by fragments on both sides. On the right 
(fig. 1) the remains of this bone exhibit traces of the two 
enlarged teeth (i, ii), and on both sides it is partly 
broken away to expose the middle enlarged teeth of the 
lower jaw. On the left (fig. 1 a) an undetermined 
fragment of bone (a?.) overlaps the anterior end of the 
premaxilla, but this probably has no connection wdth the 
jaws. The mandibular ramus is best displayed on the 
right, but its anterior pointed end is much broken here 
and the dentition is more completely displayed on the 
left. The ramus is deepest at the hinder end, where the 
dentary (cZ.) is seen to extend in a narrow band above 
the comparatively small articulo-angular bone (ar/.) ; it 
