[LAMBE] ON A NEW CROCODILIAN GENUS 229 
MM 
Breadth of upper surface of parietal posteriorly ........... 43 
Length of upper surface of parietal, in median line ......... 38 
Thickness of parietal anteriorly, in median line ........... 12.5 
Breadth of exposure of basisphenoid, anteriorly in advance 
AIT DOS AC LES, | AIDE VACCINS PPS A SP CAR ele atone 30 
Breadth of coalesced pterygoids at junction with lower ex- 
TEAR ey CICA OIALO) )3!5e care nt de dent das Ne 40 
Width of brain cavity at its mid-height, above foramen for 
eT CH OMI CTD ETES)  NOTRRNP ENS isd. ageveh nl «8 die ile) <t weylenay enone 19.5 
Height of same at centre, in line with same foramen ........ 26 
Height of exposed lateral surface of basisphenoid behind ..... 44 
Breadth of same exposed surface at mid-height ............ ih 
Length of surface preserved of roof of narial passage ........ 14 
D Same ERA 2 Lim ses le wld NUE 10 
Distance of posterior end of same to anterior edge of opening 
fn Mena bUsise nian CANAL. 2.4.0. 0, ogi e ees 16 
SePARATE FRONTAL BONE. 
The separate frontal bone (cat. No. 1404, pl. V, figs. 14 and 14a) 
has a general outline, seen from above, very similar to that of the upper- 
most plane surface of the parietal bone. It is broad behind and narrow 
in front with a maximum breadth about equal to its length. — Its sides 
are excavated for a distance of nearly three-fourths of its length from 
the front by the inner border of the orbital opening which greatly 
reduces the anterior breadth of the bone.  Laterally in front are the 
sutures for the prefrontals, a, plate V, fig. 14, between which is a 
small fractured surface indicating apparently where the front forward 
prolongation of this bone, that probably was partially over-lapped on 
either side by the prefrontals and more anteriorly by the inner back 
edges of the nasals, is broken off. The suture for the parietal, b, figs. 
14 and i4a, extends the full breadth of the bone posteriorly. On 
either side behind the orbital emargination is the suture, c, fig. 14, for 
the postfrontal. The upper surface is ornamented with large pits 
wider than the narrow ridges separating them. These pits occur with 
a decided bilateral symmetry. The whole of the under surface of the 
bone is free and smooth with the exception of an area on either side 
posteriorly for the sutural junction of the alisphenoids, d, fig. 14a. 
Between these sutural surfaces is the continuation of the concave roof 
of the brain cavity which narrows rapidly and extends forward (over 
the olfactory tract of the brain), as an axial groove, to the prefrontal 
