ni 



945. The left radius and ulna of the same Triotyx. 



11 Ifi. The ripht fciiuir of the same Triony*. 



947. The li-ft fi'iuur of the same Trioiiyt. 



'.Uv The right tibia and fibula of the same Trionyx. 



949. The left tibia and fibula of the same Trionyx. 



960. The carpaU, mctacarpals and phalanges of the right fore-foot of the same 

 Trionyx. 



951. The carpals, mctacarpals and phalanges of the left fore-foot of the same Trionyx. 



952. The tarsals, mctatarsals and phalanges of the right hind-foot of the same 



Trionyx. 



953. The tarsals, metatarsals and phalanges of the left hind-foot of the same Trionyx. 



954. The skull of an Australian Mud Tortoise (TrioHyx (Gymnopug) Bibroni). 



It differ* from the skull of the species (No. 922) allied to the Nilotic Mud Tortoiie, and 

 from that of the Gangetic sjiecies figured bj Curier *, in the total absence of the premaxil- 

 lary bone, which is rery tmaU in both those species. The external nostril in the Australian 

 species is circumscribed below by the converging extremities of the maxillary bones which 

 meet there, as in No. 922 ; but in No. 954 they similarly circumscribe the fore part of the 

 anterior palatal aperture. The Australian Trionyx also differs in the larger proportional size 

 of the prefrontals, and the greater breadth and depression of the facial part of the skull. 



Pretexted by Capt. Sir Everard Home, Bart., R.N., F.R.S. 



955. The atlas and dentata of the same Trionyx. 



966. The third to the eighth cervical vertebrae inclusive, of the same Trionyx. 



Fossiles, T. part 2. pi. 1 1. figs. 58. 



ll 



