REPTILES. 35 



extensively palmate, whilst in Borboroccetes 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. 



BoRBOROCOZTES BlBRONII. MiJli. 

 Plate XVII. Fig. 1. 



JDentibus palatinis in fasciculis distantibus obliquis pone nares posteriores positis ; 



palmis bituberculatis . 



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 tubercle 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 tubercle 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 facise of the same colour. Under 

 parts grey, with numerous brown dots. 



DIMENSIONS. 



In. Lines. 



Length of the body and head 1 5 



of the anterior extremities 1 



of the posterior extremities 2 6 



Taken at Valdivia and at Chiloe, in a thick forest, by Mr. Darwin. 



