APPENDIX. 
7 
Occurs throughout the whole of Southern Africa. It is generally discovered on the banks of 
rivers or margins of lakes, and plunges into the water the instant it is disturbed, and if the latter be 
deep it is rarely seen again after it reaches it. 
TROPI DOS AURA CAPENSIS, Dim. et Bib. Erpet. Gener. tom. v. page 171. Algira Capensis, 
Smith, Mag. Nat. Hist., new series, vol. ii. p. 94. Gray, Cat. of Lizards, British Museum, p. 36. 
Inhabits sandy flats to the northward and eastward of Latakoo, and occurs abundantly in the 
Kalahari desert. 
TROPIDOSAURA DUMERELII, n. s. 
Head subovate, narrow towards the nose ; body rather slender ; back convex ; sides slightly 
protuberant ; tail slightly depressed at the base, elsewhere cylindrical, tapered, and pointed. Nasal 
plate somewhat kidney shaped ; the nostril in the notch behind, its posterior margin formed by a small 
rhomboidal plate; naso-rostral plate six-sided, lateral sides short, its surface smooth; all the other 
plates of the upper surface of the head finely ribbed. Frontal plate club-shaped ; scales of the temples 
strongly keeled • scales of the body and sides subovate, or subrhomboidal and strongly keeled ; the 
keel prolonged into a fine pointed spine; scales of the tail long, four-sided, rather narrow behind, and 
keeled ; of the belly quadrangular, or somewhat six-sided; the lateral sides oblique, and arranged in six 
longitudinal rows.' The outermost toe of fore foot rather short, the second and third equal and con- 
siderably longer ; the outer or posterior of hinder foot short, and much behind the base of the second toe, 
the second very long, and the third considerably shorter, and the innermost very short. Femoral 
pores 12. Lower eyelid coated with small semi-pellucid plates. External ear-opening vertically ovate, 
the anterior edge nearly even, and with a long narrow plate at and towards the upper end. The ground 
colour of the upper surface of the head, the back, the sides, the upper surface of the tail, and the outer 
surfaces of the extremities, rusty buff-orang‘e, the body and base of the tail variegated with four longi- 
tudinal reddish brown, and two rusty white lines, the latter one on each side between the brown lines, 
and the second below the lowermost. Under surface of body and tail, and the inner surface of extremi- 
ties, straw-yellow, or sienna-yellow. Length from nose to base of tail, 2 inches, length of tail, 4 inches. 
Inhabits sandy deserts to the north-east of Latakoo, towards the tropic of Capricorn. 
TROPIDOSAURA BURCIIELLII, n. s. 
Figure rather slender; head narrow and tapered anteriorly; nose slightly rounded. Body 
slightly depressed; sides protuberant ; back convex. Tail at the base four-sided, towards the point 
cylindrical. Extremities slender and moderately long ; toes long and slender, the next to the outer- 
most on the hinder foot much the longest. Nostril in the hinder edge of the nasal plate and behind 
formed by the anterior margin of the naso-frenal plate. External ear-opening vertically ovate, a large 
scale anteriorly at the upper edge. Rostral plate truncated posteriorly ; fronto-nasal plate contiguous, 
somewhat five-sided, hinder side shortest ; frontal plate six-sided, slightly angular before and behind, 
lateral sides long, and slightly concave ; interparietal plate long, narrow, and subi'homboidal ; occi- 
pital plate small and nearly circular ; parietal plates subovate ; palpebral plates three, the first much 
the largest, the last very small. Temporal plates partly large, partly small, all smooth. Scales of 
back and sides rhomboidal, strongly carinated, the keel prolonged into a fine acute spine ; scales of 
tail more or less ovate and strongly keeled; plates of abdomen six-sided, and disposed in eight or nine 
longitudinal rows, those of the middle row long, transversely ; preanal plates two, one in front of the 
