APPENDIX TO THE CATALOGUE OF SHIELD REPTILES. 



27 



the inner edge obliquely raised into a sharp ridge, which is 

 wide behind and narrow in front, with a rounded depression 

 in the centre of the hinder edge. The central ridge in the 

 horny beak of the upper jaw more distinct than in the skull. 



Bartlettia, Gray, P. Z. S. 1870, p. 720. 



The skull is short and depressed, the eyes separated, fore- 

 head convex; the head covered with hard shields, the 

 crown -shield rounded in front, temporal shields large ; 

 chin with a single central beard ; the cheek-shield covering 

 part of the temporal muscle not covered by the bone. 

 The animal olive, and the head not spotted. 



Bartlettia pitipii. 



Shell olive-brown, ovate, hinder margin greatly ex- 

 panded ; the head olive above, rather paler below ; the 

 second and third vertebral shields bluntly keeled, the keel 

 most elevated on the suture between these two shields. 



The sternum paler ; the limbs, in spirit, pale yellowish 

 white. 



Bartlettia pitipii, Gray, P.Z.S. 1S70, p. 721, figs. 1 & 2 

 (skull) ; P. Z. S. 1871, p. 748, f. 3 (sternum). 



Eab. Lakes of the Upper Amazons {Edward Barllett) : 

 called " Pitipii." 



There are four specimens in the British Museum, the 

 largest being 13 inches by 11 inches, and one has been 

 prepared as a skeleton. 



The shell is very like that of Podoenemis e&pansa ; but 

 the largest specimen we have of the latter is 31 inches long 

 by 23 inches. 



This genus is named after Mr. Bartlett, the Superin- 

 tendent of the Gardens of the Zoological Society, who has 

 published several excellent papers on the manners, and 

 habits, and growth of the animals under his care. It is 

 only to be regretted that he has not printed more of his 

 notes ; for observations on these subjects from a person who 

 has the power of accurately observing and duly estimating 

 the importance of the facts observed, as Mr. Bartlett has 

 shown that he posessess, are most valuable for science ; such 

 observations can only be made by one who has the animals 

 constantly under his supervision, while the separation of the 

 species, and the deduction of systematic zoological charac- 

 ters, are able to be best effected in extensive collections in 

 Museums. 



See also : — 

 Trionyx brusseliensis, Winkler, Tort.Foss. p. 135, tab. xxix., 



XXX. 



Hob. Brussels (fossil). 



Trionyx Teyleri, WinTcler, Tort. Foss. p. 73, tab. xv. fig. 51 . 

 Hal. Oeningen (fossil). 



Glossochelys, /SW«/, Ann. $ Mar/. Nat. Hist. 1871, vol. viii. 

 p. 227. 



G. Murchisoniensis= 



Chelone Murchisoniensis, Woodward. 



Chelone planimentum, Owen. 



Hab. London Clay (fossil). 



Trionyx gangeticus (p. 97), add : — 

 Gray, Tortoises Src. t. 51 (from life). 



Tyrse nilotica (p. 108), add: — 

 Gray, Tortoises Src. tab. 55, 56 (animal and skeleton). 



Cyclanosteus senegalensis (p. 112), add: — 



Cyelanosteus senegalensis, Gray, P. Z. S. 1870, p. 717, tab. 

 43 ( from life). 



"The Society acquired by purchase, from a London dealer, 

 on the 30th August, a fine living specimen of Cyclanosteus 

 s, negalensis, Gray (P. Z. S. 18G4, p. 21), which is certainly 

 the first I have ever seen, and, I believe, the first seen alive 

 in Europe ; and it is a very interesting animal, as it has 

 the form of the freshwater Tortoise with all the other 

 characters of the Mud-Tortoises or Soft-shield Turtles 

 (Trionychidae). 



" The specimen must be nearly adult ; but if is not quite 

 so large as the dorsal shield with its margin which the 

 British Museum received from the Earl of Derby, who ob- 

 tained it from his collector, Mr. Whitfield, from Gambia, 

 which is figured under the name of Cyclanosteus Pit, ersii 

 in the ' Catalogue of Shield Reptiles.' tab. 29. It has 

 all the sternal callosities developed as in that figure ; but 

 the hinder pair, instead of being round and small, are 

 considerably larger and oval. The odd or nuchal bone 

 is placed in the margin of the cartilaginous shield, and 

 separated from the front of the dorsal bony disk by a broad 

 flexible space. 



" The animal is ovate, depressed ; the back is convex, like 

 that of a large Batacjur or Emys, with a very broad, hard, car- 

 tilaginous margin, which is thin, but rounded on the edge : 

 the hinder part of the margin is very broad and expanded, 

 slightly concave on its upper surface, and bent up like that 

 of several of the freshwater Tortoises. The whole upper 

 surface is covered with a thick, smooth, blackish-olive skin, 

 which completely hides the rugosities on the bony disk, and 



