24 BATRACHIA. 



Descr. — The head is proportionally large ; flattened above and de- 

 clivous on the sides. The snout is subtruncated ; thicker than in 

 both R. aurora and R. pretiosa. The length of the head is equal to 

 its width ; seen from above, its shape is subtriangular. The nostrils 

 are oblong and situated obliquely near the upper part of the snout, 

 nearer to its tip than to the anterior margin of the eye. The eyes 

 themselves are quite large ; their diameter is nearly equal to the dis- 

 tance between their anterior margin and the extremity of the snout. 

 The upper lid is anteriorly and posteriorly folded, more conspicuously 

 posteriorly. The tympanum is circular or subcircular ; smaller than 

 the eye ; equal in diameter to the distance between the orbit and the 

 nostrils. The tongue is thick, oblong, and elongated ; free upon its 

 posterior third. The groups of vomerine teeth are very conspicuous, 

 oblong ; situated obliquely between the inner nostrils and the medial 

 line of the palate. The inner nostrils themselves are comparatively 

 small, transversely elongated. The openings of the tubes of Eustachi 

 are subcircular, and slightly larger than the inner nostrils. 



The body is a little more than twice the length of the head, and at- 

 tenuated posteriorly. The anterior limbs and fingers are rather stout, 

 the latter swollen at their tip, instead of being pointed, as in R. pre- 

 tiosa. The carpus, beneath, is smooth ; two flattened and elongated, 

 quite large disks, may be seen at its base. The first finger is very 

 much swollen upon its first half, and conspicuously longer than the 

 second, which is the shortest ; the third is the longest, and the fourth 

 about the length of the first. Bound and stout tubercles exist under 

 each digital articulation. The hind limbs are longer than twice the 

 length of the body, the head excepted. The tibia being itself longer 

 than the femur. The toes are subcircular and webbed to almost 

 their very tip, which is swollen in the same manner as the fingers. 

 An oblong and large tubercle may be observed exteriorly at the base 

 of the first toe, and a small rounded one at the base of the fourth or 

 longest toe. Large tubercles exist under the articulations, and very 

 minute granules under the metatarsus. 



The skin above is apparently smooth, but, on examining it with a 

 somewhat magnifying power, it is found to be densely studded with 

 minute warts and granules of various magnitude, extending over the 

 head as far as the nostrils. Beneath, the skin is perfectly smooth, 

 except the posterior portion of the thighs, which is covered by a pave* 

 ment of irregularly polygonal glands. 



