952 MR. D. M. S. WATSON ON A 



The palate is of great interest ; in the restoration the general 

 features are drawn from specimens I., II., and IV., and the sutures 

 are introduced from specimen III., where the pterygoids, palatines, 

 and prevomers are disarticulated. 



Basis cranii. — The basis cranii is much crushed in all the 

 specimens and was apparently very thin and delicate. 



The two large exoccipital condyles are clearly shown in I. 

 and II. They are rounded from front to back and to a less 

 extent from side to side. The bone between them is extremely 

 thin, but no doubt is partly composed of basioccipital. The basi- 

 sphenoid in I. is slightly better preserved ; it bears two very small 

 basipterygoid processes only very obscurely indicated. In front 

 of this region it is produced into a narrow rostrum undoubtedly 

 parasphenoid. 



Extending outwards and backwards from the sides of the basis 

 cranii are two long, very delicate processes which are shown, 

 much crushed and broken, in specimens I., II., and III. In 

 specimen I. on the right side, a small foramen is rather obscurely 

 indicated on the process about a third of its length from the 

 middle line, this opening can only be the fenestra ovale. The 

 process is probably mainly opisthotic, with the prootic forming 

 some of its front border. Immediately above the exoccipital 

 condyle in the same skull is a foramen for cranial nerves ix. 

 and X. 



The outer end of the opisthotic articulates as usual with a facet 

 on the under surface of the tabulare. 



The quadrates are well shown in specimens I. ^nd II. They 

 are small bones with a w^ell-developed trochlear condyle, the outer 

 border is articulated with the quadrato-jugal, there being 

 probably no foramen between the two bones. 



The upper end of the quadrate is suppor-ted by a downwardly 

 directed flange from the squamosal, well seen in specimens I. 

 and III. The inner border of the quadrate is continued by 

 a short thin pterygoid process (specimen I.). 



The pterygoid is a large bone which articulates by a small facet 

 with the basipterygoid process of the basisphenoid (specimen I.). 

 Behind this it is continued as a deep but thin plate, the posterior 

 ramus, which articulates distally with the quadrate and whose 

 upper border has a suture with a continuation of the descending 

 flange of the squamosal mentioned above. The anterior part of 

 the bone forms a broad flat plate covered with a shagreen of small 

 sharp teeth. The anterior border of the plate is in contact with 

 the prevomer and the lateral border with the palatine. 



The palatine bears a single row of nine medium-sized swollen 

 teeth, and its outer border articulates with the jugal and maxilla. 

 There is apparently no ti-anspalatine. 



The prevomer is a small bone with a median symphysis with 

 its fellow ; it forms a good deal of the inner border of the posterior 

 nares and bears two teeth placed transversely ; its exact relations 

 to the palatine are not certain. 



