1. zonurvs. 255 
anal plates small, equal, except two marginals a little longer. 
Femoral pores seven on each side. Caudal whorls very spinous, 
the scales not serrate, but striate on the surface. Below and upper 
lip to ear yellow ; above rich brown, with several indistinct blackish 
cross shades ; head above wood-brown. 
millim. millim, 
From snout to vent.. 92 Fore limb........ 382 
From snout toear .. 44 Hind limb.. ..... 42 
Madagascar. 
3. Zonurus cataphractus. 
Cordylus cataphractus, Bote, N. Acta Ac. Leop.-Carol. xiv. 1828, i. 
p. 140; Smith, Ill. S. Afr., Rept. pl. xxix. & xxx. fig. 9, 
Zonurus cordylus, Sehleg. Tijdschr. Nat. Gesch, Phys. i. 1834, p. 211, 
pl. vil. fig. 3. 
Cordylus nebulosus, Smith, Mag. N. H. (2) ii. 1838, p. 31. 
Zonurus cataphractus, Dum. & Bibr. v. p. 355, 
Head triangular, much depressed, as broad as long in the adult ; 
snout very short. Head-shields very rugose ; nasalsin contact, much 
swollen, pierced in the centre ; frontonasal and preefrontals subequal, 
on a line, the former pentagonal, its anterior angle wedged in 
between the nasals, its posterior border forming a suture with the 
frontal ; latter seven-sided, a little wider anteriorly ; interparietal 
inclosed between the two pairs of parietals, of which the posterior 
is the largest; a row of six keeled occipitals; temporals large, 
striated and keeled, in three longitudinal] series; three temporal 
spines, upper smallest but sharpest ; four supraoculars ; three supra- 
ciliaries ; lower eyelid opaque; loreal very small, or absent ; a large 
preorbital; three infraorbitals ; six or seven upper labials, the three 
posterior largest and keeled ; rostral pentagonal, twice and a half 
as broad as high. Mental pentagonal; six lower labials, fifth 
largest, four posterior keeled ; a row of five large shields bordering 
the lower labials; four small median chin-shields; gular scales 
small, rather irregular, subquadrangular, smooth, except those on 
the sides, which are feebly keeled; four or five curved rows of 
smooth large scales under the neck; sides of neck with large spines. 
Dorsal scales large, forming regular transverse series ; these scales 
rough, elongate quadrangular, serrate posteriorly, keeled. On the 
sides the keel becomes stronger and ends in a strong spine; _ lateral 
scales otherwise not distinguished from the dorsals. A strong lateral 
fold. ‘The dorsal scales form fifteen or sixteen transverse rows from 
occiput to base of tail; in the middle of the body avseries contains 
twenty scales, counting from the lateral fold. Ventral scales quad- 
rangular, longer than broad, not imbricate, smooth, forming regular 
transverse series; latter twenty to twenty-two, the largest contain- 
ing twenty scales, A pair of enlarged posterior preanal scales. 
Limbs above with large spinose imbricate keeled scales, inferiorly 
with smooth or feebly keeled ones; thirteen to sixteen femoral 
