506 DR. J. E. GRAY ON THE GENUS CHELYMYS. [Mar. 1 9, 



small plates over the temples. Chin without any heard ; nape 

 smooth, reticulated; legs with small scales. Nuchal shield broad 

 and well developed. Crown and occiput nearly square, scarcely 

 dilated behind ; hinder edge produced in the middle. Vertebral 

 shields of the adult quite as long as broad. 



Skull depressed, without any zygomatic arch, and with a large 

 tympanic opening ; forehead and crown broad, flat, produced behind 

 in the middle of the occiput. Basisphenoid transverse, shorter and 

 broad, with a triangular projection on the front edge, produced behind 

 the hinder part of the palatine bones. The basioccipital oblong, 

 transverse, as broad as the sphenoid. 



I am inclined to think that more than one species were included 

 under the name of Chelymys macquaria in the Catalogue and Sup- 

 plement, some even belonging to what is now regarded as another 

 genus, as they have two beards, which were overlooked in the stuffed 

 specimens. 



* Thorax ovate, more or less depressed, with the hinder margin 

 expanded. Head of moderate size. 



1. Chelymys macquaria. B.M. 



Emys macquaria, Cuvier, R. A. vol. ii. p. 11. 



Hydraspis macquaria, Gray, Synopsis Rept. p. 40. 



Emydura macquaria, Bonaparte, Tab. Analyt. p. 8. 



Platemys macquaria, Dumeril and Bibrou, Erpetol. Generale, & 

 Cat. Me'th. p. 21. 



Chelymys macquaria, var. 1, Gray, Cat. Shield Rept. p. 57. 



Hydraspis australis, Gray, in Gray's Travels in Western Australia, 

 vol. ii. p. 445, tab. vi. 



Hab. Australia, Macquarie River {Gould, 1840). 



The species was originally named by Cuvier from a specimen in 

 the Paris Museum said to have been brought from the Macquarie 

 River by MM. Lesson and Garnot ; and the first four names quoted 

 are derived from this specimen. I am inclined to suppose that Mr. 

 Gould's specimen, which I described in Capt. Gray's narrative, may 

 be the same species, as it is from the same river. 



2. Chelymys victoria. (Plate XXVII.) B.M. 



Hydraspis victoria, Gray, Zool. Misc. p. 55. 

 Chelymys macquaria & var., Gray, Cat. Shield Rept. p. 57 ; Suppl. 

 Cat. Shield Rept. p. 76, fig. 25 (head) ; P. Z. S. 1856, p. 31. 



Var. 1. Shell depressed, expanded. 



Var. 2. marmorata. Back more solid and convex, marbled. 



Var. 3. sulcata. Back with a central groove, shields obscurely 

 longitudinally grooved. 



Hab. N.W. coast of Australia, Victoria River {Capt. W. Cham- 

 bers, Mr. Gould) ; east coast of Queensland, Burnett River {Mr. 

 Krefft). 



This species appears to have a very extensive geographical distri- 



