204 PELOMEDUSID ®. 
4, Podocnemis expansa. 
Emys expansa, Schweigg. Prodr. p. 30 (1814). ; 
amazonica, Spr, Test. Bras. p. 1, pls. i. & ii. figs. 1-3 (1824). 
Hydraspis expansa, Gray, Syn. Rept. p. 41 (1881). 
Podocnemis expansa, Wagl. Syst. Amph. pl. iv. figs. i.-xxxi. (1880) ; 
Dum. & Bibr. ii. p. 383 (1835) ; Gray, Cat. Tort. p. 45 (1844) ; 
Strauch, Chelon. Stud, p. 146 (1862), and Verth. Schildkr. p. 102 
(1865), 
aa part., Gray, Cat. Sh. Rept.i. p. 61, pl. xxxvil. fig. Hl 
(1855), and Proc. Zool, Soc. 1864, p. 183, 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 slightly 
exceeds the width of the hind lobe; intergular shield much longer 
than gular; the longest median suture is usually formed by the 
abdominals, the shortest by the bumerals. Interorbital space 
concaye, 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 ; supraciliary 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. Peruvian Amazon. Mr. E. Bartlett [C.]. 
b,c. Ad., skulls, Peruvian Amazon. Mr. E. Bartlett [ C. ]. 
d. Ad., skull. Upper Amazon, 
e-g. Yg., spir. Rio Ucayali. W. Davis, Esq. py 
Messrs. Veitch | P. ]. 
h-n. Ye., spir. Mandaos, Brazil. M. A. Peixoto [C.]. 
o. Yg., spir. Bahia. Dr. Wucherer | C. ]. 
p. Yg., stffd. Brazil. 
q,7. Yg., spir. E 
5. Podocnemis sextuberculata. 
Podocnemis sextuberculata, Cornalia, Vert. Syn. Mus. Mediolan, 
p- 18, pl. iii. (1849). rs 
expansa, part., Gray, Cat. Sh. Rept. i. p. 61, pl. xxvii. (1855), 
and Suppl. p. 83 (1870). 
Bartlettia pitipii, Gray, Proc. Zool. Soc. 1870, p. 720; Sclater, Proc. 
Zool. Soc. 1878, p. 741, fig.; Gray, App. Cat. Sh. Rept. p. 27 
(1872). 
Carapace much depressed, obtusely keeled, expanded posteriorly. 
Plastron large, front lobe broader than hind lobe; the width of the 
