LTASSIC PTERODACTYLES. 465 



siibrecurved, and sharp- pointed. An interval of 4 lines divides it from the second tooth 

 (2), with a crown 5i hnes 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 whicli wonkl liave 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 honiotype (!') 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 

 lower and anterior part of the narial vacuity : the maxillary is continued straight backward, 

 with feeble indications of two crushed alveoli (5, c) for 1 inch 9 lines, when the seventh 

 laniary (7) projects almost straight downwai'd : the crown of this tooth is 5 lines long; the 

 root, covered with rougher cement, slightly contracts to its implanted end, which has 

 slipped a short way out of its socket. An interval of 4 lines divides this from the next 

 laniary (8), which shows a crown of but 3 lines in length ; this projects opposite the fore 

 part of the lateral post-narial branch (21O 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, 10) of rather decreasing 

 length, project with similar or rather lessening intervals : then follows, after an interval of 

 3 lines, a pointed compressed crown Ig line in length (ii) ; and, at shorter intervals, 

 two smaller pointed compressed teeth (12 and 13). 



These thirteen cuspidate teeth of tlie 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 (/, l) 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 (20). 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 (o) is recognisable at (11) PI. 15. Above its hind part are indications of 

 the post-frontal (12) and mastoid (s), with the process of the latter descending external to 

 its articulation with the tympanic (28). The metacarpus and dislocated unguiculate digits 

 of the wing-limb are confusedly interblended with the crushed and dislocated back part 

 of this skull; three phalanges {/r \,iv2,ir3) of the wing-finger are determinable. 



The two anterior teeth (i', 2') of the mandible show longitudinal angular depressions at 

 their base, indicating exposure of their inner side, and that they belong to the left ramus. 

 The corresponding part of the right ranuis may have been broken away : the third laniary 



