Dr. J. E. Gray on Chelomans. 295 



raised margin on the outer side, and a slightly raised margin 

 on the inner side. Lower jaw produced and incurved in the 

 middle, with a sharp raised margin on the outer side, and a 

 slight raised line on the middle of the inner margin. The 

 sternum flat, slightly concave in the middle. 



Two specimens (one from Gilolo) have the hinder half of 

 the sternum decidedly concave in the middle, but not much so. 

 All the others in the Museum have this part flat. The Gilolo 

 specimen is marked as a male. 



This species varies much in the convexity of the shell, and 

 presents two very distinct varieties : — 



I. The sternum brown-varied, sometimes entirely brown. 

 The youngest specimens I have seen are of that colour 

 beneath. The dorsal plates pale, with dark brown areolae. 

 Philippines. 



II. Sternum pale whitish, with a black spot on each areola. 



The younger specimens are white on the sides and more 



or less black on the central longitudinal line of the sternum ; 



and the spots remain in the older specimens. 



Specimens of this variety come from the Philippines, 



Celebes, and Borneo. 



Cuora trifasciata. 



One of the specimens in the British Museum wants the 

 nuchal shield, which is present in all the four others. 



Cyclemys. 



The ribs of the very young specimens are lanceolate, united 

 to the vertebra as by a footstalk, then suddenly dilated, and 

 almost immediately gradually attenuated like a lanceolate leaf. 

 The sternum bony only on the margin, the four pairs of bones 

 forming a ring, leaving a very large hollow place in the centre. 

 The odd bone triangular, longer than broad ; the lateral pair of 

 bones on each side entirely separate from one another, and 

 only meeting by an attenuated process. The front lateral 

 bones united to the dorsal disk by a much nan-ower external 

 lateral process than the hinder ones. The central sj^ace be- 

 comes gradually filled up on the inner side, leaving in the older 

 specimens only a small membranous opening, which at length 

 becomes quite filled up. 



Cyclemys dhor. 



In the younger specimens the front dorsal plate is about as 

 long as broad, sometimes rather wider in front, but generally 

 contracted in front and wider on the sides, so as to be broadly 



