340 Zoological Society : — 



DaCTYLETH RI DiE . 



Head depressed ; upper jaw toothed ; tongue none ; eyes with an 

 inferior Hd ; orbits swollen, marked with transverse oblique white 

 lines of minute pores. The Eustachian tubes united into one pha- 

 ryngeal orifice. Skin smooth. Head and body with white lines 

 of minute pores, symmetrically disposed. The back with a more or 

 less distinct dorsal shield, commencing on the temples, and conti- 

 nued to the upper part of the base of the tail, marked by two series 

 of short white lines of minute pores (the outer transverse and the 

 inner longitudinal), and a more or less raised edge. The fore feet 

 with four subequal tapering free toes. The hind feet with five elon- 

 gated, rather unequal toes broadly webbed to the tips, the three outer 

 toes and the spur on the outer side of the ankle furnished with black 

 conical horny claws. 



1. Dactylethra. 



The dorsal shield indistinct, only marked by the double series of 

 glands. Mouth large, not bearded. Orbit with a small beard on 

 the under edge. 



D. CAPENSis, Cuvier. D. IceviSy Giinther. D. Miilleriy Peters, 

 Hallowell, Dumeril. 



Hub. South and South-eastern Africa. 



2. SiLURANA. 



The dorsal shield very distinct, with a raised edge, and separated 

 by a groove on the forehead. Mouth small, with an elongated beard 

 on each side at the angle of the gape. Orbit without any beard. 

 The larva fish-like ; head flat, broad, truncated ; mouth small, two- 

 bearded ; eyes in the keel of the side, shown above and below ; 

 body swollen ; tail elongate, compressed ; the belly and underside 

 of the tail with a broad, membranaceous fin continued to the end 

 of the tail. 



S. TROPiCALis, Gray, Ann. & Mag. N. H. ser. 3, vol. xiv. 

 p. 316. 



Hab. Lagos {R. B. N. Walker, Esq.), 



Revision of the Genera and Species of Cham^leonidje, 

 WITH THE Description of some New Species. By Dr. 

 J. E. Gray, F.R.S., F.L.S., etc. 



The Chameleons form one of the most natural families of Lizards, 

 as well as one of the most clearly defined. The distinction of the 

 species from one another, as is almost always the case in a natural 

 group, is difficult, and requires careful study and consideration. 

 The species in general are well marked when the characters are elimi- 

 nated ; but there are a few species, as CKamcBleon vulgaris and C. se- 

 negalensisy which have a broad geographical distribution, that offer 

 several variations such as, if the differences did not appear gradually 



