REPTILES. 
35 
extensively palmate, whilst in Borhoroccetes the hinder legs are much longer, and 
the toes scarcely at all webbed. The former structure indicates a greater power 
of swimming, and the latter of leaping. 
Borboroccetes Bibronii. MiJii. 
Plate XVII. Fig. 1. 
Dentihus palatinis in fascimlis distantihiis obliquis po7ie nares posteriores positis ; 
palmis hituherculatis. 
Habitat, Chiloe and Valdivia. 
Description. — Head depressed, the vertex slightly concave between the orbits ; front (space in- 
cluded between two lines drawn from the anterior corner of the orbits to the point of the 
nose) triangular and distinct. Nostrils lateral. Eyes rather prominent. Tongue broad, 
ovate, acuminated in front, behind entire and rounded, the posterior half and the sides de- 
tached. Palatine teeth in two oval parcels, direct obliquely backwards and inwards, and 
situated at some distance behind the line of the posterior margin of the nares. Tympanum 
concealed. Body rather depressed and short. Skin smooth and without pores or glands, 
excepting on the posterior and inferior surface of the thighs, where there are some small 
granular elevations. Fore legs two-thirds the length of the head and body. The fore-arm 
rather larger than the upper arm. The fingers entirely separated, the third considerably the 
longest. A small tuberele under each joint, and two on the palm near the wrist. Length of 
the hinder legs to that of the head and body as 5 to 3, or rather more. Toes connected only at 
their base. A small tuberele under each joint, and a very depressed one at the base of the 
inner toe. 
Colour of the upper parts fuscous, with a lateral fascia extending from the orbit nearly to the 
thigh, of a dark-brown colour, bordered with whitish ; and another of an elongated triangular 
form on each ilium. Legs with transverse incomplete facias of the same colour. Under 
parts grey, with numerous brown dots. 
DIMENSIONS. 
Id. Lines. 
Length of the body and head 1 5 
of the anterior extremities 1 0 
of the posterior extremities 2 6 
Taken at Valdivia and at Chiloe, in a thick forest, by Mr. Darwin. 
