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
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