LIASSIC FORMATIONS. 
43 
dislocated that side of the upper jaw; the hind part of this ramus is obliquely depressed, 
so as to expose the inner surface (32). 
The anterior entire or undivided part of the premaxillary (22) is about 2 inches in length, 
and inch in vertical height at its back part : it contains four pairs of teeth, which are 
the largest and longest of the series. The foremost tooth (1) is terminal, with a crown 
5 lines in length, rather over 1 line in breadth (fore-and-aft) at its base ; it is subcompressecl, 
subrecurved, and sharp-pointed. An interval of 4 lines divides it from the second tooth 
(2), with a crown 5 i lines long. After an interval of 7 lines projects the crown (3) of 
the third tooth, 7 lines in length and 2 lines in basal breadth, sharp-pointed like the first, 
but less bent. The socket and base (?) of the fourth tooth appear at an interval of 
6 lines, and below is the entire and displaced homotypal tooth (4') of the left side, showing 
the cavity on the inner side of its root which would have received the successional laniary. 
This tooth measures 1 inch 2 lines in total length, of which the exposed enamelled crown 
forms two-thirds. In advance of the foremost tooth (1) is seen part of its homotype (!') of 
the left side, also displaced from the socket, and showing the depression and vacuity on 
the inside of the base, in relation to the succeeding tooth. Beyond the fourth alveolus 
the maxillary (21) appears, underlapping the part of the premaxillary ( 22 ") which defines the 
longer and anterior part of the narial vacuity : the maxillary is continued straight backward, 
with feeble indications of two crushed alveoli (5, 6) for 1 inch 9 lines, when the seventh 
laniary (7) projects almost straight downward: the crown of this tooth is 5 lines long; the 
root, covered with rougher cement, slightly contracts to its iuiplanted end, which has 
slipped a short way out of its socket. An interval of 4 lines divides this from the next 
laniary (s), which show^s a crown of but 3 lines in length ; this projects opposite the fore 
part of the lateral post-uarial branch (21^) of the maxillary. The base of the left 
homotypal tooth (s') projects from the same part of the dislocated left alveolar branch of the 
maxillary ; and above this, on the inner side of that bone, is exposed the coronal germ of 
a successor. In the right maxillary two other straight laniaries (9, lO) of rather decreasing 
length, project with similar or rather lessening intervals : then follows, after an interval of 
3 lines, a pointed compressed crown line in length (11); and, at shorter intervals, 
two smaller pointed compressed teeth (12 and 13). 
These thirteen cuspidate teeth of the upper jaw are included in an extent of the 
alveolar border measuring 5 inches 2 lines. That border is continued backward, straight 
and edentulous, for 9 lines beyond the last tooth, when it is crossed by the large and long 
first phalanx {ir i) of the wing-finger. This edentulous part of the maxillary forms the 
lower straight border or base of the large triangular antorbital vacuity (a), at the back 
part of which it is overlapped by the fore part of the slender malar (26). Above this 
vacuity are parts of the nasal (15) and prefrontal (14), both somewhat displaced in this 
crushed part of the skull. The arched part of the frontal forming the upper part of the 
rim of the orbit (0) is recognisable at (11) PI. XVII. Above its hind part are indications of 
the post-frontal (12) and mastoid (s), with the process of the latter descending external to 
