EMYDIDJE. 



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- 

 ward. It furnishes the whole front of the cara- 

 pace (fig. 439), most of which was wanting in 

 the type. The nuchal has a maximum width of 

 82 mm., but this would be less if the bone were 

 archt as usual. The free border of the bone 

 measures 39 mm. The front border of the cara- 

 pace is very acute to the beginning of the second 

 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 ot some ot the peripherals and ot 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 vertebrals. 



No. 



T , Width 

 Length. . , 



* in front. 



Greatest 



width. 



1 55 



65 



3 68 



4 



79 

 39 

 38 



45 



79 

 70 

 67 

 8o 



Dimensions of marginals. 



No. 



Height Greatest L f n & h 



, . ,. of free 



in front, height. . , 



" border. 



'9 



2 3 



24 

 28 

 21 



2 5 



3> 



35 

 40 



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 w r idth 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 

 are wider than those of the type. The beveled surface on 

 the upper side of the hinder lobe is 25 mm. wide. 



The gulars have a length of 40 mm.; the numerals, 

 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. 



Fig. 439. Echmatemys <zgle. Cara- 

 pace. X \. No. 5976 A.M. N. H. 



