CATALOGUE OF SHIELD REPTILES. 



CI 



e. Claws 5*4. Head convex, i-ounded, covered with hard 

 shields; beaks naked. 



Chelydidae B. e, Gray, Cat. Tort. B.M. 36 (1844). 

 Podocnerais, Wayler, Si/sf. 135 (1830). 



9. PELTOCEPHALTJS. 



Head large, subquadraugular, ]iyramidal, covered with 

 six large, thick, rather imbricate plates ; forehead rounded. 

 Eyes lateral. Jaws naked, very strong, hooked, toothless. 

 Feet strongly webbed, with two large scales near the claws, 

 without any compressed scales on the front edge of the 

 hind legs. Claws 5-4, straight, strong. Tail clawed. 

 Shell ovate, convex, rounded before, nicked behind. Nu- 

 chal plate none. Sternum solid; marginal plates 10- 10; 

 two caudal plates united into one plate. 



Peltocephalus, Bum. ^ Bib. Erp. Gin. ii. 3/7 (1835) ; Cat. 

 Meth. R. 18. 



Fitz. Syst. Kept. 29. 

 Podocnemis, sp., Wagler, Syst. 135. 



1. Peltocephalus Tracaxa. The Tracaxa. 



Shell ovate, smooth, entire, blackish-brown ; gular plates 

 very small, subequal ; pectoral plate short. 



Peltocephalus Tracaxa, Dum. i^- Bib. Erp. Ght. ii. 378. 

 t. 18. f. 2; Cat. Meth. R. !8. 



Gray, Cat. Tort. B.M. 45. 



Fitz. Syst. Rejit. 29. 

 Emys Tracaxa, Spi.v, Bras. 6. t. 5. 



Wagler, Syst. 135. 

 Emys maerocephala, Spi.r, Bras. 5. t. 4, old shell, worn. 

 Podocnemis tracaxa, Wagler, Syst. 135. 

 Podocnemis maerocephala, Wagler, Syst. 135. 



Hab. Brazils. 



a. Adult (stuffed). Shields concentrically grooved. 

 Emys Tracaxa, Spi.v, Bras. t. 5. 



b. Adult (stuffed). Worn nearly smooth ; head imperfect. 



Brazils. 



E. maerocephala, Spix, Bras. t. 4. 



10. PODOCNEMIS. 



Head convex ; crown with five shields, two nasal, one 

 frontal, large, and two temporal, with a deep groove on the 

 forehead ; cheeks with large shields. Chin two-bearded. 

 Jaws naked, slightly arched, toothless. Eyes superior, 

 close. Legs with some thin cresceutic scales in front. 

 The upper part of the hinder edge of the hind foot 

 covered with three large flat shields. Toes broadly webbed, 



with two broad thin scales above. Claws 5 "4, short, broad, 

 flattened. Tail short, not clawed, with a diverging series 

 of horny cross ridges on each side. Shell rather solid ; 

 sterno-costal symphysis elongate; marginal plates 12'12; 

 caudal separate. Nuchal plate none. Sternum broad, not 

 mobile, narrower behind. 



Podocnemis, sp., TT'agter, Syst. 135. 



Podocnemis, Dum. ^- Bib. Erp. Gen. ii. 282 ; Cat. Mith.R.lH. 



Fitz. Syst. Rept. 29. 



Gray, Cat. Tort. B.M. 25. 



1. Podocnemis expansa. The Pitipu. Tab. XXVII. 



Shell oval, entire, keelless, very depressed when adult, 

 tectiform and rather moderately keeled when young, much 

 and horizontally expanded over the hind legs. Head broad, 

 short ; of young white-spotted. 



Podocnemis expansa, Wagler, Syst. 135. t. 4. f. 1, 2. 



Dum. ^ Bib. Erp. Gen. ii. 383. t, 19. f. 1 ; Cat. M^th. 

 R. 18. 



Gray, Cat. Tort. B.M. 45. 



Fitz. Syst. Rept. 24. 

 Emys Amazouica, Spix, Bras. i. t. 1, adult; t. 2. f. 1, 2, 



young. 

 E. expansa, Schweig. Prod. 299. no. 8. 



Schlegel, Faun. Japon. 48. 

 Hydraspis expansa. Gray, Syn. Rept. 41. 

 Testudo Arrace, Humb. Pers. Nar. iv. 482 ? 



Hab. Brazils ; Cayenne. Mus. Paris. 



b. Adult (stuffed). Lakes of Upper Amazons : called Pi- 



tipu. Mr. Bates's Collection. 



c. Young (in spirits). Head blackish, with a white edge 



to the sides of the nasal and upper orbital edge ; back 

 of the head with foiu' round equal spots, the lateral 

 one above the front of the tympanum ; vertebral plates 

 bluntly keeled ; marginal plate very wide. 



d. Young (stuffed ; rather deformed). Animal and shell 



black ; head white-spotted. Brazils. Zoological So- 

 ciety. 



" Podocnemis expansa," Bibron, MSS. Cat. Zool. Sac. 

 no. 366. 



Osteology. Tab. XXXVII. fig. 1, skull. 



Emys expansa, Cuv. Oss. Foss. v. 184. t. 1 1. f. 9-12, skull. 

 Podocnemis expansa, Wagler, Syst. t. 4. f. 3-31. 



a. Adult (female). Shell only. 

 Mr. Bates's Collection. 



e. Skull. ^Ir. Bates's Collection. 



Brazils : called Pitiu. 



Spix described the young as having a yellow head with 

 two black dots, which does not agree with the Museum 

 specimens. 



Schlegel regards E. amazonica and E. erythrocephata as 

 synonyma of this species. 



