II i:n pi: TO LOO v. 337 



G. GRANDis, Gruy. 



Colour above voiy dark brown, almost black ; below liamlsomely black ami yellow 

 rayed. Caudal plates 2. Grows to 18 inches. 



Inhabits ro<?u and Tonasserim. 



This species is more aquatic iu its habits than flu; last, and the shell is often 

 encrusted with weeds. 



G. BKPRKssA, .\ndcrson. 

 G. Arakana, Theobald. 



The following were the characters of an Akyab specimen in my possession. 

 Colour uniform yellowish, dark-mottled ; below yellow. Claws of hind feet very 

 long. An aged female measured 9-5 inches on a straight line. 

 Inhabits Akyab. 



G. spixos-v, Hell. 



Shell keeled and serrated. Colour brown above ; yellow below, handsomely 

 brown-rayed. In the young each costal jdate is armed with a distinct spine, which in 

 aged animals is worn down to a tubercle. In a young shell before me, of f> inches, 

 the temlency to a spinous develo|)ment in the plates is shown by the nuchal plate 

 being bispinous in front and keeled, and by the 3rd and 4th vertebral keels being dis- 

 tinctly bispinous behind. The gular, too, presents the lateral curved spine mentioned 

 in Giinther's description. 



Grows to 10 inches or more, and inhabits Pinang and Tenasserim. 



Familij Cistvidinidse. 



Feet adapted for walking or swimming. The sternum usually flat in both sexes, 

 attached to the thorax by a ligamentous suture and transversely divided into two 

 mobile lobes. 



CVoEA, Gruy. 



C. Amboinensis, Daud. 



Colour above dark brown or blackish, with a pale vertebral line. Below pale 

 primrose yellow, with a black blotch on the outer posterior single of each plate. The 

 sternum is attached to the thorax by a ligamentous suture, and divided into two 

 mobile lobes. Grows to ten inches. 



Inhabits Pegu, Tenasserim, the Malayan Peninsula, Java, and Anibuhia. 



Cycle.mvs, Bell. 



The transverse pectoral suture in Cijclcmyn is formed Tiy the permanent non- 

 anchylosis of the pectoi-al-abdominal suture, indicated externally by a carious fold 

 traversing the plates, and is more obvious in aged than in young animals. 



C. DENTATA, Bell. 



Colour pale olive, radiately brown streaked. Grows to 8 inches or more. 

 Inhabits Pegu and Tenasserim. 



Pyxidea, Gray. 



No transverse sternal hinge. 

 P. MoDHOTii, Gray. 



Colour yellowish, browner on the sides. Shell with tlu'ce keels. Sternum 

 separated from the thorax, as in the last species, but with no transverse suture. 

 Grows to 7 inches or more. 



Inhabits Cochin China and Kachar, and probalily therelbre Burma, though as yet 

 um-ctorded there. 



22 



