570 MR. W. R, B. OLIVER : REVIEVf OF THE 



expanded portion of the maxillfe cum-ing in anteriorly, and 

 forming the lateral prominences at the base of the rostrum and 

 -dividing, the anteorbital notches. Proximal ends of premaxillse 

 strongly everted and overhanging the • nares ; both directed 

 •obliquely backwards, the right 12*5 cm., the left 7 cm. long. 

 Right nasal bone forming the vertex, the left smaller and lower. 

 Mesorostral appearing between the premaxillse throughout its 

 length ; width at rostral base 2'3 cm., at 14 cm. in advance 1 cm., 

 thence widening out towards the distal end. Its proximal end 

 is a thin vei'tical ridge of bone. Foramen magnum 5x4 cm., 

 occipital condyles 7 x 4'2 cm. No basirostral groove. Temporal 

 fossse pyriform, above the level of the occipital condyles. On the 

 lower surface of the skull the pterygoids diverge, showing the 

 palatines as narrow divergent stripes on each side, about 10 cm. 

 long and 1 cm. wide. Between the palatines the two edges of the 

 maxiilse meet as a median ridge, the bones anteriorly diverging 

 and exposing the vomer. The palatines appear again above the 

 pterygoids, their anterior ends being level with the pterygoid 

 fossae. Pterygoids broken, but the exterior deeply concave and 

 the basal portion parallel and meeting for a distance of 13 cm. 



Mandible : Length of ramus 63 cm., of symphysis 15 cm. ; tip 

 to anterior end of left tooth, 13*5 cm.; tooth-line along upper edge 

 of I'amus, 11 cm.; width of ramus at posterior end, 12'5 cm.; 

 narrowest portion behind tooth 7 cm., at anterior edge of tooth 

 6*5 cm. The upper margin curves upwards and slightly outwards 

 (but is not swollen) to form the walls of the alveolus, the internal 

 wall being much higher than the external wall, which in the 

 present specimen falls, but may be broken. (PL TV. figs. 1 & 2.) 



Tooth : The left tooth only is preserved. Its anterior margin 

 at its junction with the upper edge of the ramus is 15 mm. in 

 advance of the posterior end of the symphysis. Anteriorly the 

 tooth is slightly concave, posteriorly strongly convex. The apex 

 is directed slightly forwards. The base is formed of eight 

 irregular fangs. Anterior margin, 13-8 cm. ; base, about 10'5 

 cm. ; thickness, 2*4 cm. 



Hyoid bones: Thyrohyals separate; length, 17 cm. Other 

 bones not preserved. 



Vertebrae: C. 7, D. 10, L. 9, Ca. 15 = 41. Atlas, axis, and 

 third cervical fused by both centra and neural arches, 4th and 

 5th fused only by the neural arch on the right side ; 6th and 7th 

 free. Atlas without diapophyses ; two conical spines on crest. 

 Diapophyses and parapophyses all separate. Seventh cervical 

 with long diapophyses directed forwards, parapophyses reduced to 

 knobs, above which are the articular facets for the tubercula of 

 the first pair of ribs. Dorsals with centra concave above. Trans- 

 verse processes of the anterior seven opposite the neural arches 

 and bearing articular facets for the tubercula of the first seven 

 ribs. The first six dorsals bear tubercles on the posterior edges 

 of the centra for the articulation of the capitula of the 2nd to 7th 

 ribs. The 8th, 9th, and 10th dorsals bear short transverse 



