UPON HYPERODAPEDON GORDONI. 



693 



Fig. 4. Under view of the mandible. \ nat. size. 



5. Front view of the prern axillary rostrum and the anterior nares. 



<§■ nat. size. 



6. Series of mandibular teeth: a, anterior, posterior end. Nat. size. 



7. The remains of the atlas, and fig. 8, the succeeding cervical vertebras. 



Nat. size. 



9. Prassacral vertebras, with the proximal end of a rib. Nat. size. 



10. The remains of the first sacral vertebra. Nat. size. 



11. The left fore limb. ^ nat. size. 



12. The right hind limb. ^ nat. size. 



Plate XXYII. — Ehynchosaurus ccrticeps. 



Fig. 1. Under view of an imperfect skull. Nat. size. 



2. A series of caudal vertebras. Nat. size. 



3. The right shoulder-girdle, ventral aspect (No. 2), and the left fore 



limb, dorsal aspect (No. 3). Nat. size. It is doubtful whether cl 

 is really the clavicle. 



4. Impressions of the left pubis and ischium, and remains of the bones 



of the left hind limb as they lie in No. 3. Nat. size. 

 5 Eight hind foot, ventral aspect (No. 1). Nat. size. 



Discussion. 



The President remarked that he felt he only expressed the sen- 

 timents of all the Fellows present in welcoming back their past 

 President to the scene of his former triumphs. The type specimen of 

 Hyperodapedon was so imperfect that it was marvellous the charac- 

 ters ascribed to the genus required so little modification in conse- 

 quence of the far more perfect specimen now described. 



Mr. Hulke could only re-echo the President's congratulations on 

 the reappearance of Prof. Huxley. He could hut admire the clear 

 manner in which this very interesting reptile had been described by 

 him. 



Dr. Geikie recalled the early controversies about the age of the 

 Elgin Sandstones, and pointed out that no satisfactory stratigraphical 

 solution of the puzzle had yet been found. A line between the beds 

 with Mesozoic Reptilia and those containing Holoptychius would 

 never have been drawn but for the extraordinary contrast of the 

 organic remains. By physical characters it was not possible to 

 separate them. 



Prof. Seeley said that caution was necessary in concluding that 

 such types were limited to one system. The Reptiles of South 

 America associated with L&pidodendron and Schizodus, partly de- 

 scribed by Prof. Cope, have close affinity with some from South 

 Africa which are usually regarded as Triassic. 



The form of articulation of the vertebras being merely generic in 

 Amphibia, it is not surprising to find that some reptiles have opis- 

 thocoelous vertebras. Some recent lizards also show peculiar forms 

 of the abdominal ribs, as in Plesiosaums, which are present in many 

 Triassic reptiles, though enveloped with matrix, so as to form abdo- 

 minal rods like those seen in this fossil. In conclusion, he spoke of 

 the satisfaction he experienced in once more hearing Mr. Huxley. 



Mr. Lydekker notified the occurrence of Hyperodapedon in India 

 associated with Parasuchus and Belodon ; but the associated ver- 



