902 PELOMEDUSID&. 
B. Alveolar ridges short and feeble. 
Mental barbels two. 4... 10.01 sees oe 4. expansa, p. 204, 
Amrimeter barbell cfe.c aie crieesuelsreei neue 5. sextuberculata, p. 204. 
Il. Forehead flat; jugal in contact with the quadrate. 
Intergular shield very small, shorter 
than the gulars ; interparietal shield 
POILeMGDEMIMNG. Ae nkjc eecus at. 6. madagascariensis, p. 205. 
Intergular shield longer than the 
gulars; interparietal shield widening 
behind’ tee etre icra mie mtnaCa ed. 20G. 
1. Podocnemis dumeriliana. 
Emys dumeriliana, Schweigg. Prodr. p. 31 (1814). 
cayennensis, Schweigg. l.c. p. 29. 
erythrocephala, Spra', Test. Bras. p. 9, pl. vil. (1824). 
Hydraspis dumeriliana, Gray, Syn. Rept. p. 42 (1831). 
cayennensis, Gray, l. ec. 
lata, Gray, l.c. p. 77. 
Podocnemis dumeriliana, Dum. § Bibr. ii. p. 3887 (1835); Gray, Cat. 
Tort, p. 45 (1844); Strauch, Chelon. Stud. p. 147 (1862); Gray, 
Proc. Zool. Soc, 1864, p. 154. 
dumeriliana, part., Gray, Cat. Sh. Rept. i. p. 62, pl. xxviii. 
(1855). 
Chelonemys dumeriliana, part., Gray, Suppl. Cat. Sh. Rept. i. p. 83 
(1870), and App. p. 25 (1872). 
Carapace oval, rather convex, but feebly expanded posteriorly ; 
usually second and third vertebral shields with an obtuse keel. 
Plastron large, front lobe broader than hind lobe ; the width of the 
bridge at least equals the width of the hind lobe; intergular shield 
much longer than the gulars; the longest median suture is formed 
by the abdominals, the shortest by the humerals. Interorbital 
space concaye, much narrower than the diameter of the orbit; 
upper jaw not hooked ; a large interparietal shield, behind which 
the parietals usually form a suture; this shield subcordiform and as 
broad as long in the young, much elongate in the adult; the width 
of the mandible at the symphysis exceeds the diameter of the orbit ; 
alveolar surface of upper jaw with two strong ridges, running along 
the whole length of the jaw; lower jaw with three cutting-edges, 
the median and the inner close together. Chin with two short 
dermal appendages. Two very large shields on the outer border 
of the foot. “Carapace brown or blackish above; lower surface 
yellowish or brownish, with blotches of blackish; head reddish 
brown in the adult, in the young blackish, with a yellowish band on 
each jaw, a yellowish spot behind the eye, and a pair of yellowish 
round spots with black centre on the interparietal shield. 
Length of shell 38 centim. 
System of the Amazon. 
