TRIASSIC STRATA OF THE SOUTH COAST OJT DEVONSHIRE. 319 



of a Labyrinthodont, No. 2, there appears to me to be no difference 

 between this and Eeptilian bone-structure generally. It is totally 

 different from that of the Lepidostean scale. 



Lastly, as regards the above-mentioned spine, having examined 

 generally and microscopically the spines of two species of Hyhochis, 

 I have to state that not only are the latter hollow and the former 

 solid, but the bone-structure is quite different in the two cases ; 

 thus I can see no lacunse at all in the spines of Hybodiis, although 

 there are canaliculi. Hence, whatever this fossil may be, we have 

 no grounds for regarding it as a " spine." 



Discussion. 



The President observed that perhaps the most interesting remark 

 in the paper was that relating to the so-called spine of Mr. Metcalfe's 

 paper. 



Mr. Smith Woodward said that on a former occasion he had 

 suggested that the spine was the premaxilla of ITyijeroda2)edon 

 (see p. 16^). He still adhered to that view. 



Mr. Whitaker commented upon the complete destruction of the 

 fish by the reptiles of the Triassic age. 



Q.J.G.S. No. 175. 



