1872.] 



DR. J. E. GRAY ON THE GENUS ELSEYA. 



513 



rapidly converging in front ; the gular shields very narrow, elongate ; 

 intermediate plate, small, linear ; nuchal plate none. 



Elseya dentata, Gray, Ann. & Mag. Nat. Hist. 1867, xx. p. 44 ; 

 Suppl. Cat. Shield Rept. p. 76. 



Had. North Australia, Upper Victoria (presented by Dr. John 

 Elsey) . 



There is a specimen of the shell of this animal in the British Mu- 

 seum without any part of the animal. Therefore we do not posi- 

 tively know that it belongs to this genus ; but it agrees with it in 

 having no nuchal plates and in having the hinder margin sinuated. 



The shell is much more dilated on the hinder margin, has the 

 margins of the ribs separate, and a considerable hole covered with 

 membrane in the centre of the sternum. The Aertebral plates are 

 all much longer than broad, the second and third being broadest, 

 with an obscure tubercle ; the fourth is nearly as long as broad, and 

 keeled. 



Elseya dentata, from Krefft's photograph. 



Dr. Krefft has sent me a photograph of the underside of the animal 

 in spirit of this species, showing the existence of two chin-beards, 

 Proc. Zool. Soc— 1872, No. XXXIII. 



