321 
EMYDID&. 
The neural bones are of moderate width; the table shows their dimensions: 
The length of the nuchal was close to 56 mm.; its width along the free border about 42 mm.; 
its greatest width is 67 mm. The free border of the nuchal and those of the first peripherals 
Dimensions of neurals. Dimensions of peripherals. 
ae sl oe | Width of | Width of | 
No. Length. Width. No. Height. free costal 
P : I border... | _ border. 
I 42 22 I 44 37 17 
2 34 2 2 40 36 24 
3 49. if H *3. 45 43 she 
5 45 45 45 
The dimensions of the peripherals are shown in the table above. 
Vertebral. Marginal. 
Scute. Width. Height. Length 
UES eel - of free 
In front. Greatest. In front. | Greatest. border. 
I 65 79 79 15 26 32 
2 76 38 65 26 35 37 
3 (he 38 6o+ 30 30 39 
The upper surface of the carapace is nearly smooth, but is relieved by striation and faint 
lines of growth; but these are not so distinct as they are on Cope’s type of E. septaria. The 
second and third vertebral scutes are urn-shaped, expanded in front, and narrowed behind. 
The first vertebral is the broadest. The dimensions of vertebral and marginal scutes are given 
in the second table above. 
= ieee 
“6th. 
neural 
<4. No. 6085 A. M.N. H. 
417. Upper surface of free border of hinder lobe of plastron. 
418. Section across shell at the inguinal buttresses. Shows the sixth peripheral (per. 6), the 
fifth costal plate (c. p. 5), and the right and left inguinal buttresses (r. ing., /. ing). 
It will be observed that the second marginal is unusually high. This is true in both No. 
6085 and No. 6089. As shown by both these specimens, the costo-marginal sulci run near the 
costo-peripheral sutures ; in No. 6085, a few millimeters below; in No.6089, on the sutures. 
The plastron (fig. 416) has a total length of 345 mm. The anterior lobe is 95 mm. long and 
133 mm. wide at the base, the length thus being 71 per cent. of the width. The entoplastron is 
50 mm. long and 53 mm. wide. Immediately in front of the axillary notch the lobe narrows a 
21 
Fics. 417 AND 418.—Echmatemys septaria. 
