216 DR. J. E. GRAY ON THE TORTOISES. [ Mar. 1], 
is nearly adult. Jaws strong; alveolar surface broad in front and 
on the sides, rather broader on the sides behind, that of the lower 
jaw shelving inwards. The anterior central palatine groove deep, 
narrow in front, and wider behind. 
1. LANDEMANIA IRRORATA. 
Head and body closely speckled with minute white dois ; the chin 
and underside of the throat with rather larger but similar white 
spots. 
Trionyx peroculatus, Giinther, MS. in B. M. 
A specimen (which had been allowed to get dry) now in spirit, from 
Shanghai. Head black (face without any diverging lines), with very 
small white speckles very close together, and most of the same size 
and form, of underside (if any difference) very slightly larger; the 
skin of the back similarly and equally minutely white-dotted. Ster- 
nal callosities six; the anterior pair narrow, band-like, transverse, 
in the centre of the front of the sternum ; lateral callosities narrow 
in the middle, very broad at the inner end; the anal broad, sub- 
trigonal, united in the middle line by a truly dentated suture. 
2. LANDEMANIA! PEROCELLATA. 
Head olive, with diverging brown lines from the eyes and across 
the forehead ; chin and throat with large white spots. ‘ 
Trionyx perocellatus, Gray, Cat. Tort. B. M. p. 48; Cat. Shield 
Rept. p. 65, t. 31. 
Potamochelys? perocellatus, Gray, P. Z.S. 1864, p. 86. 
Hab. China and Chusan. 
A specimen in spirit, received from Mr. Swinhoe, from Formosa. 
The front of the lower jaw with a flat triangular alveolar surface ; 
the central groove in the palate before the internal nostrils narrow, 
deep, wider (sublunate) quite in front. Forehead with a narrow in- 
terrupted dark line from the front canthus of one eye to the other. 
Face with five diverging brown lines from the underside of the eye— 
the three front to the lower lip, the two hinder from the hinder ean- 
thus of the eye across the temple. Sternal callosities four; the 
hinder pair subtrigonal, with the angles rounded, and well sepa- 
rated. Sides of lower jaw, chin, and throat with large, symmetrical, 
but different-shaped white spots. 
A stuffed half-grown specimen in the British Museum, from China. 
The bony dorsal disk oblong ; the front odd bone united to the first 
costal by a straight edge, and rugose like it, with a very small pit on 
each side of the middle of the hind edge; the front edge with a few 
tubercles in the centre ; the hinder flap with roundish tubercles. 
Sternal callosities four; lateral narrow on-the sides, much wider in 
the middle ; the hinder callosities ovate, oblique, with short convex 
sides and rounded ends. Head moderate; alveolar surface of the 
jaws broad, rather broader behind; the anterior central palatine 
groove deep, wide, and rather wider behind. 
