Dr, J. E. Gray on the Box Tortoises. 107 
Il. Sternum-lobes subequal, 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, solid. Sternum flat ; lobes rather narrow, 
truncated in front, notched behind. 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. 
Pyxipea Movuotit. 
Cyclemys Mouhotii, Gray, Ann. & Mag. N. H. 1862, x. p. 157. 
Hab. 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 ec. 
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 trtfasciata, 
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 Hmys 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. 
