512 DR. J. E. GKAY ON THE GENUS ELSEYA. [Mar. 19, 



of the young of this species, or as indicating the existence of a pe- 

 culiar species of which as yet we have received hut one specimen. 



2. Elseya spinosa. B.M. 



Front of the sternum broad, much broader on the hinder part, 

 and with a rounded outline ; intermediate plate broad ; nuchal plate 

 very narrow and small. 



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

 p. 118. 



Thorax broad, rounded in front, above brown varied with black ; 

 beneath pale brown marbled with black. 



Hab. North Australia (1866). 



Only a single specimen of this species has been received, and it is 

 so like some specimens of E. latisternum that it may possibly be an 

 example of that species accidentally possessing a nuchal plate. 



3. Elseya? intermedia. B.M. 



The front lobe of the sternum rather wider than the hinder one, 

 regularly rounded ; the hinder lobe with straight sides in front, and 

 contracted in the hinder half; nuchal plate none. 



Elseya dentata (adult), Gray, Suppl. Cat. Shield Rept. p. 76. 



Hab. North Australia, upper part of Victoria (Dr. J. Elsey). 



This shell is very like a very old specimen of Elseya dentata ; but 

 I prefer to describe it separately until we get more examples. 



The thorax (which is without any remains of the animal) is ovate, 

 very solid and convex ; the hinder margin is dilated and much wider 

 in front, and much reflexed on the sides. Nuchal plate none. Second 

 marginal plate on each side wider than the rest ; the first vertebral 

 plate five-sided, produced on the front of the inner margin; the 

 second, third, and fourth vertebral plates four-sided, rather sinuated 

 on the side of the margin ; the second and third rather more than 

 half as long again as broad ; the fourth much narrower, twice as long 

 as broad ; the fifth triangular, broader than long. The sternum dark 

 brown, with irregular white marks in the centre. The intergular 

 plate moderately broad. The gular plates small, triangular ; post- 

 gular plates moderate, narrowed on the inner edge ; the pectoral and 

 other plates large. 



The front vertebral plate five-sided, rather angularly produced in 

 front, considerably broader than long. The second, third, and fourth 

 are six-sided, longer than broad, the fourth being narrowest and 

 longest, and each having a more or less distinct central prominence 

 near the hinder edge. The bones of this specimen are well-knit, and 

 do not show the signs of youth. 



/3. Front lobe of the sternum narrow, narroiver than the front part 

 of the hinder lobe ; the sides of the front part straight, divergent. 



4. Elseya dentata. (Fig. 5.) B.M. 

 The front lobe of the sternum narrow, with the sides nearly straight, 



