1116 ON THE BILOELA LABYRINTHODONT, 



belong to the northern hemisphere, and are Diclyocephalus, Eupelor, 

 Pariostegus. To these forms Mr. Lydekker (Palaeontologia Indica, 

 Ser. IV. Vol. I. Part 4), has added Gondwanosaurus, the Labyrin- 

 thodont from the " Bijori Group," which forms the top of the 

 Damuda, and immediately underlies the Panchets which contain 

 their Dicynodon, Gonioglyptus, Pachygonia, <kc, and are probably 

 more or less contemporary with the MaDgli group which has yielded 

 Brachyops laticeps, (lib. cit. p. 2). Again, in Part 5 of the same 

 volume the same author describes certain Mastodonsaurus and 

 Pachygonia remains from the Maleri and Denwa Groups, and gives 

 a table of homotaxial affinities, from which I extract the following 

 table : — 



Commencing with the Upper Trias (Rhaetic and Keuper of 

 Europe) ; Maleri, (Upper Gondwana) of India, and here indicated 

 by the Roman numeral I. we have 



I. Europe. I. India. 



Belodon. Belodon. 



Hyper 'odapedon Hyperodapedon. 



Mastodonsaurus. Mastodonsaurus. 



Ceratodus Ceratodus. 



Lower down we arrive at the Bunter and Muschelkalk of 

 Europe, the Panchets of India, where we find. 



II. Europe. II. India. 



Trematosaurus. Dicynodon. 



Pachygonia. 

 Gonioglyptus. 

 It is hardly necessary to observe that Dicynodon is a character- 

 istic fossil of the Karoo beds in South Africa ; and, for my own 

 part, I believe that the appearance of this strange and obsolete 

 type was contemporaneous, in India and Africa, within the not 

 excessive limits of one hundred centuries, or ten thousand years, 

 which many and various considerations seem to indicate as the unit 

 of geological time ; (Croll, ' Climate and Time,' passim), and that in 

 like manner the Mastodonsaurus, Capitosaarus, or whatever it may 

 prove to be, certifies the contemporaneity under such wide condi- 

 tions as have been indicated above, of the rocks seen at Biloela 



