EMYDID.&. 365 



The unusual width of the fourth and fifth vertebral scutes is proved In Cope's type and 

 confirmed by the Port Kennedy specimen. Belonging to the latter is a fragment of the cara- 

 pace presenting a part of the nuchal, a part of the first and second costals and the first and 

 second peripherals (fig. 467A). In T . Carolina the first vertebral does not usually encroach on 

 the first peripheral hone; in the fragment alluded to above, the vertebral reaches over on the 

 first peripheral nearly to the sulcus between the first and second marginals. The anterior 

 vertebral must have been ^4 mm. wide, about 6 mm. wider than in a specimen of T . Carolina 

 at hand. We must conclude that the other vertebrals were wider than thev co 

 T . Carolina. An estimate makes it probable that the fourth vertebral in T 

 about 42 mm. wide. 



Fig. 467(7 presents a view of the fragment of the rear of the carapace of the Port Kennedy 

 specimen, the interrupted lines having been added in order to show the position of the frag- 

 ment. The crossing of the sulci on the upper portion of the drawing indicates the presence of 

 a small scute cut off from the fifth vertebral, a slight abnormality. In fig. 467^ the peripherals 



mmonly are in 

 urypygia, type, was 



4.67a. 

 FlGS. 466 and 4(17. Terrapene eurypygia. Xi- 



467A. 

 Portions of Carapace. 



466. Rear of carapace of type. t.p. 7, c p. i, seventh and eighth costals; m. .<. 11, m. s. 12, eleventh and twelfth 



marginal scutes; per. io, per. 1 1, peripherals; py, pygal; spy, suprapvgal. 

 467a. Rear of carapace, r. p. 8, eighth costal plate; per.<), per. 10, per. 1 1, ninth to eleventh peripherals; m. s. 9. 



m. s. 10, m. s. 11, m. s. 12, ninth to twelfth marginal scutes; py, pygal; spy, suprapvgal. The letters m. 1. 



of ninth marginal lie partly on tenth marginal. 

 4676. Front of carapace, r. p. I, first costal bone; nu. p., nuchal bone. 



and marginals are indicated. The tenth scute is the one lying partly on the ninth peripheral 

 and partly on the tenth. In both figures the bony sutures are represented by zigzag lines, 

 while the sulci between the scutes are shown by dotted lines. 



The plastron of the Port Kennedy specimen is 131 mm. long. In general it resembles that 

 of T. carolma. The width of the hinder lobe is 79 mm.; the length was almost exactly the 

 same. In the case of 6 specimens of T. Carolina examined the width of this lobe is from 4 to 

 6 mm. wider than long; in one individual the width is 2 mm. less than the length. The form 

 and dimensions of the scutes of the plastron are essentially as they are in T . Carolina. 



\ study of the plastron of the Port Kennedy specimen makes it evident that this portion of 

 the shell was almost everywhere thicker than in the corresponding parts of 7". Carolina. Nearly 

 the whole of the border of the anterior lobe is thicker and with a more rounded edge. The 

 hypoplastron of T . Carolina at the hinge is 3 mm. thick; that of T. eurypygia, 4 mm. The 

 sloping, scute-covered bonier of the hinder lobe, at the union of hypoplastron and xiphiplas- 

 tron. is in T . carolma 5 mm. thick; in T. eurypygia, 7 mm. thick. This border is also wider 

 in the latter species than in any specimens of the living species at hand. 



Fig. 408 represents the plastron of the specimen described above from the Port Kennedy 

 cave. It resembles that of T. Carolina but appears to be relatively more elongated. 



