118 Dr. J. E. Gray on new Australian Tortoises. 



liad the same peculiarity, which had been overlooked in the 

 dried state. The three specimens in the Museum (one in 

 spirit, another stuffed, and a third a thorax only) all agree in 

 colour, sculpture, and general external appearance, and are cer- 

 tainly a species which I did not distinguish, and combining the 

 characters of Chelymys and Elseya. I propose to name the 

 group 



EUCHELYMYS. 



Thorax convex, solid ; cavity contracted in front ; nuchal 

 shield narrow, well developed ; vertebral shields broad, the 

 fifth as broad as or broader than the others ; marginal shields 

 dilated behind. Head covered with continuous skin and a 

 hard smooth surface behind ; temples and over the ears with 

 numerous small polygonal plates ; chin with two distinct 

 beards. Fore legs with large transverse scales in front, and 

 with keeled scales on the outer margin. Upperside of neck 

 more or less warty. 



This genus is known from Chelymys by its having two di- 

 stinct beards, by the harder crown to the liead, and by the size 

 of the fifth vertebral plate, which in Chelymys is scarcely as 

 broad as the other vertebral ones. 



Euchelymys sulcifera. 



Dark olive-brown, marbled with white below ; vertebral 

 shields irregularly longitudinally sulcated, with a central con- 

 tinued longitudinal groove ; neck dark olive, with a white 

 streak from the angle of the mouth under the ear on each side, 

 slightly warty above ; crown of the head covered with a 

 smooth skin ; occiput not broader than the temples, with an 

 oval smooth plate on each side, 



Chelymys macquaria, var., Gray, P. Z. S. 1850, p. 371 ; Aim. ^- May. N. 

 H. 18G3, xii. p. 98; Suppl. Cat. Shield Reptiles, p. 75. 



Hah. North Australia {Stittchbury, 1856). 



Euchelymys spinosa. 



Thorax brown varied with black above, pale brown marbled 

 with black beneath ; head and neck olive ; upper surface of neck 

 darker, with rows of large, elongate, conical spines ; crown 

 hard, rather irregidarly grooved ; occiput dilated behind, 

 broader than the tom]iles, hard and polished. 



JIab. North Australia (1806). 



This species is very different from the former in the large 

 size of the head, covered above with a hard horny surft\ce, and 

 in the back of the neck being so distinctly spinose. 



