EMYDID£. 315 
The first suprapygal has a length of 34 mm. and a width of 29 mm. The second supra- 
pygal is 38 mm. long and about 78 mm. wide. 
The dimensions of the peripherals appear in the following table. 
Dimensions of peripherals. Dimensions of vertebral scutes. Dimensions of marginal scutes. 
Width = Width 
No. | Height. eos aid No. | Length. of front. width. NO+ of front. height. free border. 
I 49 53 34 I 88 85+ 854 I 20 27 49 
2 49 5° I 2 82 59 66 2 25 30 49 
3 50 47 28 3 gt 43 60 3 23 24 49 
6 62 48 46 4 17 52 4 26 29 45 
8 ae 42 7 30 40 SI 
The free border of the nuchal and that of the first pair of peripherals are acute. 
The vertebral scutes are long and narrow. The dimensions of these and the marginal 
scutes are given in the tables above. 
As stated already, the plastron (fig. 408) has a length of 370 mm. The anterior lobe is 102 
mm. long and 163 mm. wide. The length is therefore about 63 per cent. of the width. The 
407. 
Fics. 407 AND 408.—Echmatemys haydent. Carapace and plastron. X4+. No. 3943 A. M.N. H. 
407. Carapace. 408. Plastron. 
free border is acute on the hyoplastrals, but becomes thickened and subacute and fnally 
rounded near the lip. The latter is 63 mm. wide. This has the appearance of having been cut 
off square in front, with a short, blunt tooth on each side. On the upper side (fig. 409), from 
the acute free border of the lip, the bone thickens backward a distance of 25 mm., where 
the thickness is 14 mm. The width of the horn-covered surface at the union of the epiplastral 
and hyoplastral bones is 22 mm. The entoplastron has a length of 66 mm. and a width of 75 
mm. The bridge is 148 mm. wide. 
