BY PROFESSOR STEPHENS, M.A., F.G.S. 1181 



triangular), the greatest width is more in advance, the parietal 

 foramen is much further behind the orbits, and the anterior suture 

 of the frontals far more forward than its apparent position in our 

 specimen. The sculpture of the head, from which the name is 

 derived, is in the form of detached and promiscuously scattered 

 pits, whereas in ours it shows traces of regular and radiate 

 arrangement. Moreover, if we denote the greatest breadth of the 

 head by the co-efficient 100, since that dimension may probably 

 have more stable relations to the distances of the orbits and 

 foramen from one another and the occiput, we obtain the following 

 table of comparison : — 



Bothriceps Australis. Platyceps Wilkinsonii. 



Greatest breadth 100 100 



From centre of occiput to posterior 



end of orbit 115 43 



Length of orbit 61 25 



Width 46 20 



Least width of interorbital space 34 25 



The relative distances of the ' foramen ' from the orbits I have 

 not calculated, but judged from the eye. As I cannot refer this 

 fossil to any previously described genus, I am induced to give it, 

 provisionally, and only for the sake of convenience, a name of its 

 own, although it savours somewhat of rashness to found a genus 

 upon a specimen in so low a stage of development. I propose, 

 therefore, to call it Platyceps Wilkinsonii, the specific name being 

 given in honour of our respected Vice-President, Mr. C. S. 

 Wilkinson, F.G.S., &c, by whose kindness I have been enabled to 

 submit the specimen to a prolonged examination. 



[Lydekker, however, in his description and figures of the Bijori 

 Labyrinthodont, (jrondwanosaurus Bijoriensis (Pal. Ind. Ser. IV., 

 Vol. 1, pt. 4.) touches on so many points which are, to say the 

 least, illustrative of this specimen, that I am induced, secundis 

 curis, to give a brief account of his statements and conclusions, 

 as they fall in with the course of this paper. The head of 

 Gondwanosaurus then, to begin with, is elongate, being about 

 half as long again as broad. But the value of this character 



