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peculiarity Is also seen somewhat exaggerated in Mr. Blyth's type. 

 The zygomatic arch is well developed, as in most emydines, and 

 therein differs from Geomyda grandis, in which the arch is want- 

 ing. Mr. Blyth's type was a male, and is slightly different in 

 form from the living examples I have described ; but I can detect 

 no sufficient specific characters of separation ; but not having 

 the means of examining the skuU, which has been carried to 

 England by Dr. Anderson, I am unable to say if its zygomatic 

 arch is complete or not ; and in default of a comparison of skulls, 

 I cannot separate the Chaibassa and Naga Hill forms. A female 

 laid three cylindrical eggs, 1'75 long, by 1 inch broad. Should the 

 skull of the type possess an imperfect zygomatic arch, it wiU 

 then have to be placed in Geomyda, whilst the living specimens 

 described now will remain under their present designation. 



Family CistudinidjE. 



Fresh water chelonians, with feet webbed and adapted for 

 walking or swimming. The sternum usually flat in both sexes. 

 Sternum attached to the thorax by a ligamentous suture, and 

 transversely divided into two mobile lobes. Food, vegetable or 

 animal. 



CuoEA, Gray. 



C. Amboinensis, Daud. 



Nuchal plate oblong. Sternum divided into two mobile lobes, 

 by a transverse ligamentous suture. Shell arched posteriorly. 

 Colour above dark brown or blackish, with a pale vertebral 

 line ; beneath, pale primrose yellow, with a black blotch on the 

 outer posterior angle of each plate, both ventrals and marginals. 

 Sides of head with two yellow bands : the upper, from the nose 

 over the orbit to the neck ; the lower through the lower half of 

 orbit and tympanum to the lower half of the tieck. Grows to 10 

 inches. 



Inhabits Pegu, the Malayan Peninsula, Camboja, Java, Sumatra, 

 Amboyna, and the Philippine Islands. It is probably the most 

 terrestrial in its habits of its family. 



