284 Dr. J. Anderson on new Asiatic Chelonia. 



Geoemyda depressa, n. sp. 



Shell much depressed, the depression increasing from before 

 backwards, the shell being somewhat expanded across the 

 inguinal region. Anterior border broad and posterior slightly 

 concave ; posterior margin behind inguinal notch serrated. 

 Vertebrals with an obscure ridge. Anal notch moderately 

 deep. Nuchal small. Gulars well developed, anterior border 

 transverse. Shell above light brown, with a blackish tinge 

 on the external border of the marginals. Sternum rather 

 clear yellow ; the interval between the axillary and inguinal 

 notches deep black, the outer halves of the pectoral and anal 

 plates being blackish brown, with a partial reticulation extend- 

 ing across the plates ; the gulars, postgulars, and anals have 

 also a tendency to be coarsely and irregularly reticulated with 

 the same colour. 



Head of animal rather small ; upper and lower jaws deep, 

 and area below the nose slightly convex. Limbs large, espe- 

 cially the hind legs ; claws strong, and webs well developed. 

 The anterior aspect of the lower part of the fore leg convex, 

 with large umbonate scales, and smaller scales on the dorsum 

 of the foot, a large scale being at the base of each claw. Hind 

 limb covered with small scales, but with a line of enlarged 

 scales along its posterior margin. Tail moderately long, and 

 covered with small rounded scales. The neck-skin loose, and 

 covered with minute scales. Head (in life) leaden ; iris brown ; 

 neck and skin of limbs pale yellowish brown. Large scales 

 on limbs dark, almost black, with brownish margin. 



Length of shell to caudal notch 9 inches, depth through 

 centre of shell 3, breadth at axillary region 5'9, breadth 

 across inguinal notch 6" 7 ; length of sternum 8'1. 



Hab. Arakan. 



Trionyx nigricans, n. sp. 



Carapace rather flattened on the back, with the vertebral 

 groove ill defined anteriorly, but well marked posteriorly. 

 Nuchal swelling broader than in T. gangeticus, but not promi- 

 nent, the carapace on either side being flattened. Ala3 of 

 plastron well defined, projecting equally beyond the carapace. 

 Nuchal flap narrow, and covered with rather large nodose 

 folds ; and the hinder portion of the cartilaginous margin of 

 the carapace with little nodosities. The rugosities of the 

 osseous carapace coarser than in T. gangeticus. The under 

 surface of the thighs and tail and of all the soft parts, in- 

 cluding the head and neck, covered with little papillae. No 

 trace of rugosities on the azygos plate of the plastron visible 



