28. URANISCODON. 179 
Plica, Gray, Griff. A. K. ix. Syn. p. 40, and Cat. Liz. p. 223. 
Uperanodon, Dum. § Bibr. p. 247; Fitzing. 1. ¢. 
Ptychosaurus, Fitzing. 1. e. p. 59. 
Ptychoplewra, Fitsing. 1. c. 
Uraniscodon, Gray, Cat. p. 222. 
Tympanum distinct. Body subcylindrical or depressed; a slightly 
serrated dorsal ridge; dorsal scales small, imbricate, uniform. Upper 
head-scales enlarged, occipital very large. Neck strongly plicate 
inferiorly, the folds forming a pair of pouches on each side; no 
gular sac. Digits compressed, bent at the articulations, with keeled 
lamellz inferiorly. No femoral or preanal pores. ‘Tail long, cylin- 
drical or compressed. Lateral teeth tricuspid, the anterior ones 
slightly enlarged and canine-like ; pterygoid teeth present or absent. 
A large sternal fontanelle. No abdominal ribs. 
South America. 
1. Uraniscodon umbra, 
Uraniscodon umbra, Gray, Cat. p. 222. 
pictum, part., Gray, l.c. p. 223. 
Lacerta umbra, Zinn. S. N. i. p. 367. 
Agama picta, Wied, Abbild. 
Lophyrus ochrocollaris, Spex, Spee. Nov. Lacert. Bras. p. 10, pl. xii. 
fig. 2 
Uraniscodon umbra, Kaup, Isis, 1826, p. 90. 
pictum, Kazp, l. ce. 
Hypsibatus umbra, MWagl. Syst. Amph. p. 150. 
Uperanodon ochrocollare, Dum. § Bibr. iv. p. 248. 
pictum, part., Dum. & Bibr. p. 251. 
Hyperanodon peltigerus, Cope, Journ. Ac. Philad, (2) viii. 1876, 
p. 170. 
—— umbra, Peters, Mon. Berl. Ac. 1877, pp. 408, 413. 
Snout short and very broadly rounded; nostril small, turned up- 
wards; upper head-scales usually with small granular asperities ; 
anterior supraorbital scales transversely dilated, forming two di- 
verging series; a series of large transverse supraoculars ; occipital 
broader than long, as broad as or broader than the supraocular 
region; labials large, four or five upper and five or six lower; ear- 
opening large, its anterior border not or but very slightly denticu- 
lated. A strong oblique antehumeral fold; a feeble longitudinal 
and a strong transverse gular fold, the latter forming a small pouch 
on each side ; sides of neck feebly plicate, without spines. Dorsal 
crest most developed on the nape, reduced to a very slight ridge on 
the back. Body not depressed; dorsal scales as large as or a little 
larger than ventrals, rhomboidal, keeled, the keels forming oblique 
lines ; ventrals rhomboidal, more or less distinctly keeled or shortly 
mucronate. The size of the scales varies considerably. The ad- 
pressed hind limb reaches the ear or the eye. Tail round or slightly 
compressed, slender, at least twice as long as head and body. Red- 
dish or purplish brown above, with more or less distinct blackish 
cross bands; a broad black band on the antehumeral fold, sometimes 
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