58 MR. D. M..S. WATSON ON THE 



described above in Scyrnnognathus whaitsi. There is no trace 

 of the great anterior projections of the basisphenoicl which in 

 Scyrnnognathus meet in median suture in advance of the pituitary. 



There is an ethmoid, which, so far as its very incomplete 

 exposure allows it to be seen, does not differ from that of 

 Scyrnnognathus . 



The squamosal of Leptotrachelus is remarkable for the great 

 length of its lateral projection and the extreme suddenness of 

 the posterolateral coiner. As in Scyrnnognathus its distal end 

 is received between two bones, here almost certainly the jugal 

 and postorbital. 



The cup-shaped depression in the widened lower edge of the 

 squamosal into which the head of the quadrate fits is very narrow, 

 not half the width of the projection of the squamosal. 



The quadrate is a relatively large bone about 30 mm. high by 

 15 mm. wide ; it forms a nearly parallel straight-sided figure, the 

 lower edge being a little marked off by a groove and forming the 

 articular surface. The upper end is rounded and fits snugly into 

 the hollow in the squamosal. The quadrato- jugal is fused with 

 the articular margin of the quadrate ; it then separates from 

 that bone, leaving a small quadrate foramen, whilst farther 

 dorsally it spreads out into a flat sheet of bone which covers the 

 outer margin of the quadrate and laps over its posterior surface. 



When articulated with the squamosal the quadrate and 

 quadrato-jugal are largely visible from behind. 



The maxilla of Leptotrachelus shows a single canine in use, 

 with traces of the crown of a successional canine high up in the 

 alveolus, and four cheek-teeth ; it is possible that there was really 

 a fifth cheek-tooth. 



Ltcosaurus pardalis Owen, Cat. Foss. Rept. 1876, p. 15, 

 pi. 14. 



The type-skull of Lycosaurus pardalis was re-examined and 

 discussed by Broom, Proc. Zool. Soc. 1911-12, p. 1079, who gave 

 it a dental formula : i. 5, c. 2, m. 4. 



The type-skull (R. 1717, B.M.N.H.) from the Cistecephalus- 

 zone (?) of the Sneeuberg is considerably crushed laterally, but 

 has the anterior end of its snout complete and well-preserved ; 

 behind the canine on the left side the outer surface of the skull 

 is complete to the orbit, the whole orbital margin is present and 

 a bit of the edge of the parietal region. The other side is a, 

 weathered face which cuts further and further into the skull 

 until it so far crosses the middle line as to expose the admedian 

 surface of the left epipterygoid and completely to remove the 

 brain-case. The squamosals are completely destroyed. The 

 right lower jaw is, however, nearly perfect, having suffered only 

 the loss of the posterior part of the angular so as to expose 

 the articular — the position of the quadrate is thus fixed. The 

 parts of the skull remaining are quite well-preserved and show 

 many sutures. 



