464 DR. J. E, GRAY ON DACTYLETHRA. [Noy. 8, 
The disk is not distinguishable, except as a slight thickness on the 
back of the base of the tail, in the two fish-shaped larvee. This shield 
is peculiar; it would almost seem to show that there is a certain 
affinity, or analogy, between the Toads and the Chelonians, or rather 
the freshwater Emydians. 
DACTYLETHRIDZ, 
Head depressed ; upper jaw toothed; tongue none; eyes with an 
inferior lid; 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. DacryLeTHRA. 
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. levis, Giinther. D. miilleri, Peters, 
Hallowell, Duméril. 
Hab. 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. TRopicatis, Gray, Ann. & Mag. N. H. ser. 3, vol. xiv. 
p- 316. 
Hab. Lagos (R. B. N. Walker, Esq.). 
