EMYDID&. 333 
the anterior three-fourths of the shell. It had almost exactly the same size as the preceding 
specimen, the length from the front of the carapace to the xiphiplastron being 233 mm. The 
specimen has been considerably crusht down- 
eae FR a erent Deir von ward. It furnishes the whole front of the cara- 
Ses pace (fig. 439), most of which was wanting in 
Neural. | Length. Width. | Costal. Proximal} Distal the type. The nuchal has a maximum width of 
idth. | width. : A 
ie r 82 mm., but this would be less if the bone were 
archt as usual. The free border of the bone 
32 41 
I 2 > ~ 
i 2 Ec 4 39 56 measures 39 mm. The front border of the cara- 
3 36 26 | 4 29 38 pace is very acute to the beginning of the second 
4 32 a7 | 30 2 sis ce ee ; 
: ee. a 7 a Ff peripheral. The accompanying table shows the 
dimensions of the neurals. 
The costal plates of this specimen are modi- 
fied more than those of the type. The widths of the ends are given in the table above. 
The width of the first costal is equal to 65 per cent. of its height near the hinder border. 
The dimensions of some of the peripherals and of the vertebral and marginal scutes are 
shown below in tabular form, 
The maximum thickness of the nuchal and the first peripheral at their suture is 12 mm. 
Dimensions of peripherals. Dimensions of vertebrals. Dimensions of marginals. 
(eer | Width | Width See anny Teva toe | Length 
: | Width | Greatest Height Greatest | ig 
No. Height.) of free of upper) No. Length. in front.| width. No. in front.| height. of free 
a ____ border.) border, a Mice. er border. 
I 40 35 20 I 55 79 | 79 I 19 24 31 
2 38 37 19 2 65 39 | 70 2 23 28 35 
3 | 39 40 28 | «(3 68 38 | 67 3 20 21 40 
4 36 41 38 4 45 | 80+ 4 21 254 35 
| 
The first and second peripherals are 12 mm. thick at their articulation. The maximum thick- 
ness of the hinder articular end of the seventh neural is 15 mm. 
The vertebral scutes resemble those of the type. The nuchal scute is 17 mm. long, 10 
mm. wide in front, expanding to 18 mm. behind. The 
marginal scutes have the dimensions given in the table 
above. 
The surface of the carapace is smooth, except that 
on the neurals and proximal ends of the costals there are 
fine longitudinal striations. 
From the plastron the xiphiplastrals are missing. 
The length of the anterior lobe is 82 mm.; the width 
of the base is 130 mm. The length is therefore only 63 
per cent. of the width. It is possible that this is a sexual 
difference, the lobes of the type being somewhat narrower. 
The width of the epiplastral lip is 54 mm. The upper 
surface of the front of the lobe resembles that of the type, 
except that there is a broad channel on each side of the 
midline, extending out to the lateral tooth. The horn- 
covered areas of the upper surface resemble those of the 
type. The bridge is 130 mm. wide. 
The hinder lobe is 141 mm. wide. It will be 
observed that both the anterior and the posterior lobes 
fuck usin E piemapevene,t Care are wider than those of the type. The beveled surface on 
pace. Xt. No. 5976 A.M.N.H.__ the upper side of the hinder lobe is 25 mm. wide. 
The gulars have a length of 40 mm.; the humerals, 
23 mm.; the pectorals, 64 mm.; the abdominals, 79 mm. The axillary scutes fail of reaching 
the fifth marginal by 14 mm. The inguinal scutes extend forward so as barely to meet the 
sixth marginals. 
