Dr. J. E. Gray on the Box Tortoises. 107 



II. Sternum-lobes subeqiial, both forming part of the lateral sym- 

 physis. The Old World. 



i. Hind foot elongate ; toes very unequal, nearly free, second longest . 

 2. Pyxidea. 

 The thorax convex, soHd. Sternum flat ; lobes rather narrow, 

 truncated in front, notched behmd. Legs with large band-like thin 

 shields in front ; toes short, scarcely exserted, with band-like shields 

 above, slightly webbed. The hind feet rather elongate : toes slightly 

 webbed, short ; the second rather elongate, produced, with a large 

 claw. Claws conical, acute. 



PVXIDEA MOUHOTII. 



Cyclemys Mouhotii, Gray, Ann. & Mag. N. H. 1862, x. p. 157. 



Hub. Lao Mountains, Siam. 



The back is flattish and sharply three- keeled. 



ii. The hind foot elephantine ; toes subequal. 



3. CiSTOCLEMMYS. 



Thorax convex, solid. Sternum nearly flat, rounded before and 

 behind ; the front lobe large, partly enclosed in the symphysis. The 

 fore feet subclavate ; the toes very short, nearly enclosed, not webbed ; 

 the claws short, blunt. The hind feet elephantine, subcircular ; toes 

 very short, enclosed. Soles with two series of large prominent 

 shields ; the hinder edge keeled, but scarcely produced. Tail 

 shielded beneath. Asiatic. 



This genus, in the convex and solid structure of the thorax, is like 

 Cistudo ; but the foot is more like that of the Land-Tortoises ; and 

 the hind foot is subcylindrical, instead of elongate as in the Ame- 

 rican genus. 



CiSTOCLEMMYS FLAVOMARGINATA. 



Dark brown, shields of the back deeply concentrically grooved ; 

 the sternum flat, black ; the lower side of the margin of the thorax 

 yellow ; head olive, temple yellow, with a yellow streak on each side 

 of the crown, becoming wider and triangular behind. 



Cuora trifasciata, var.. Gray, Cat. Shield Reptiles in B.M. p. 42. 

 Specimen c. 



Hab. China {J. Reeve, Esq.) ; Formosa (R. Swinhoe, Esq.). 



The surface of the shell is often more or less eroded ; the one 

 which we first received from Mr. Reeve was so on the whole upper 

 surface. The form of the foot, as well as the height and thickness 

 of the shell, at once separates this species from Cuora trifasciata, 

 with which I formerly confounded it, 



Mr. Swinhoe informs me that this Tortoise is very abundant in 

 the ponds in the district of Tamsuy, N.W. Formosa. He did not 

 fall in with it in South Formosa, where the Emys Bennettii^ is the 

 prevailing species. He has frequently seen the Tamsuy Tortoise 

 showing its head and the top of its back on the surface of the water 



* Emys sinensis proves to have been founded on the young state of this species, 

 as is shown by the fine series of specimens brought from Formosa by Mr. Swinhoe. 



