204 PELOMEBUSID>E. 



4. Podocnemis expansa. 



]']mys exp<aiisa, Sc/mrii/;/. Prodr. p. ."iO (1814). 



auiazonica, Spit, Test. Bras. p. 1, pis. i. & ii. ti{,^'5. 1-3 (1824). 



Ilydraspis expansa, Gray, Syn. Kept. p. 41 (1831). 



rudocneniis expansa, Wck/I. Syst. Amph. pi. iv. figs, i.-xxxi. (1830) ; 



Dam. A- Bibr. ii. p. 383 (1835) ; Gray, Cat. Tort. p. 45 (1844) ; 



Sf ranch, Chehn. Stud. p. 146 (18G2), and Verth. Schildkr. p. 102 



(18(35). 

 expansa, part.. Gray, Cat. Sh. Bept. i. p. 01, pi. xxxvii. fig. 1 



(1855), and Proc. Zool. Soc. 18G4, p. 133, and Suppl. p. 83 (1870). 



Carapace much depressed in the adult, tectiform in the young, 

 expanded posteriorly. Plastron large, front lobe as broad as or 

 broader than hind lobe ; the width of the bridge equals or shghtly 

 exceeds the width of the hind lobe ; intcrgular shield much longer 

 than gular ; the longest median suture is usually formed by the 

 abdominals, the shortest by the humerals. Interorbital space 

 concave, much narrower than the diameter of the orbit ; upper jaw 

 not hooked ; a large interparietal shield, behind which the parietaLs 

 form a short suture, if any ; the width of the mandible at the sym- 

 physis exceeds the diameter of the orbit ; alveolar surface of upper 

 jaw with three short ridges, median strongest ; lower jaw with 

 three cutting-edges, the median shortest. Chin with two short 

 dermal appendages. Two very large shields on the outer border 

 of the foot. Brown or olive above, spotted with darker ; plastron 

 yellowish, spotted with brown. Young olive above, yellow in- 

 feriorly ; supraciHary borders yellow ; a yellow spot behind the eye 

 and a pair on the interparietal shield. 



Length of shell 77 centim. 



Tropical South America east of the Andes. 



a. Ad., skel. reniviau Amazon. Mr. E. Bartlett [C.l. 



b, c. Ad., skiiUs. Peruvian Amazon. Mr. E. Bartlett [C.J. 

 d. Ad., skuU. Upper Amazon. 

 e-y. Yg., spir. Rio Ucayali. W. Davis, Esq. 



Messrs. Veitch 



h-n. Yg., spir. jNIanaos, Brazil. M. A. Peixoto [0.]. 



0. Yg., spir. Bahia. Dr. Wucherer [C.]. 



p. Yg., stffd. Brazil. 



q, r. Yg., spir. - — - ? 



5. Podocnemis sextuberculata. 



Podocnemis sextuberculata, Cornalla, J'erf. Syn. Mas. Mediolan. 



p. 13, pi. iii. (1849). 

 expansa, part.. Gray, Cat. Sh. Bept. i. p. 61, pi. xxvii. (1855), 



and Suppl. p. 83 (1870). 

 Bartlettia pitipii, Gray, Proc. Zool. Soc. 1870, p. 720 ; Sclater, Proc. 



Zoo!. Soc. 1878, p. 741, fig. ; Grai/, App. Cat. Sh. Bept. p. 27 



(1872). 



Carapace much depressed, obtusely keeled, expanded posteriorly. 

 Plastron large, front lobe broader than hind lobe; the width of the 



