'The Expedition for the survey of the rivers Euphrates and Tigris, carried on by order of the British government, in the years 1835, 1836, and 1837; preceded by geographical and historical notices of the regions situated between the rivers Nile and Indus. In four volumes. With fourteen maps and charts, and embellished with ninety-seven plates, besides numerous wood-cuts. Volume the first.' [‎736] (836/905)

736
APPENDIX.
[no - V.
10. Vipera Euphratica (Martin). Allied to bat d.ffer S
in the disposition of the plates around, and between the nostrils, and in the
style of its colouring. A large fossa indicates, as m the aper
ture of the nostrils, and within this a valve, only to be seen when the fossa is
opened, stretches obliquely across, forming the posterior margin of the nasal
canal, as it extends from the bottom of the fossa.
The rostral plate is large and rounded above; the muzzle is larger and
swollen; the eyes sunk, but are not overshadowed, as in F. elegans, by a
single superciliary plate; the scales, however, which occupy its place, are
somewhat larger than those covering the top of the skull between the eyes.
A large elongated scale intervenes between the nasal cavity and the rostral
plate. The scales between the nostrils are larger than those which succeed
them; the labials are rather small, the fourth from the rostral being the
largest—their number on each side is ten. The scales on the top of the head
are small, keeled, subacute at the points; those of the trunk are large, flat,
elongated, with round points, and narrowly keeled.
Subcaudal plates 47 pairs.
Body stout and robust, gradually tapering to the apex of the tail.
The general colour of the upper surface is brownish gray, minutely freckled
with black, the dots of which are more clustered on the sides, in some places,
and at regular intervals, giving the appearance of obscure cloudedor
nehulcB. The plates of the under surface are pale yellow, obscurely mottled,
and dotted with dusky gray.
Length of head and body . . . 4 feet 5 inches
Length of tail .... Tr ,,
11. Bufo Arabicus.
12. Bufo variabilis.
13. Hyla arborea.
14. Testudo (tortoise).
15. Gecko. ;
16. IguanidcB (family of lizards).
17. Lacertinidce (ditto).
18. Ophidia (family of snakes).
19. Ameiva (great spotted, or ameiva lizard).
20. Batrachia (frogs.) Seven species in the upper districts only.
21. Crocodilus (crocodile).