1872.] 



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



509 



EUCHELYMYS SULCIFERA. B.M. 



Thorax dark olive-brown, marbled with white below ; vertebral 

 shields irregularly longitudinally sulcated, with a central continued 

 longitudinal groove ; neck slightly warty above, dark olive, with a 

 white streak from the angle of the mouth under the ear on each 

 side. 



Chelymys macquaria, var., Gray, P. Z. S. 1856, p. 371 ; Aun. & 

 Mag. Nat. Hist. 1863, xii. p. 98 ; Suppl. Cat. Shield Rept. p. 75. 



Euchelymys sulcifera, Gray, Ann. & Mag. Nat. Hist. 1871, viii. 

 p. 118. 



Hab. North Australia (Stutchbui-y, 1856). 



3. Elseya. 



Head covered with hard shields, which are incompletely divided into 

 five large frontal and temporal plates ; the nasal and frontal united, 

 and with a small triangular central plate. The hinder part of the 



Fig. 3. 



Skull of Eheya latisternum. 



top of the head much wider than the front ; the hinder edge rather 

 sinuated on each side. Temporal muscles moderate, covered with 

 reticulated scales. Chin with two beards. Back of the neck covered 



