BATRACHIAAXOURA. 21 



series of pores, one on each. side. A glandular ridge along the 

 upper jaw. 



STN. Rana preliosa, B. & G. Proc. Acad. Nat. Sci. Philad. VI, 1853, 378. 



OBSERV. Tlie chief feature, which will at once distinguish this 

 species from the preceding one, consists in its much shorter limbs, 

 especially the hind ones, together with the membrane of the feet which 

 extends to the very tip of the toes. The granulation of the body and 

 inferior surface of the feet, are other external characters which may 

 assist in distinguishing it from Sana aurora. The groups of vomerine 

 teeth approximate also closer together, and the tongue is free upon a 

 greater extent than in the latter species. 



DESCR. The head is a little broader posteriorly than long ; its 

 upper surface is subconcave. The snout is rounded, less prominent 

 than in R. aurora, and declivous on each side. The nostrils, which 

 are situated towards its upper surface, are elliptical in shape, and 

 placed midway between the extremity of the snout and the anterior 

 rim of the orbit. Immediately behind the nostrils may be observed a 

 little depression, into which fits a mammelliform tubercle, attached to 

 the membranes passing over the nostrils themselves. The eyes are 

 large and subcircular, and greater in diameter than half the distance 

 between them and the tip of the snout. The tympanum is subcircular 

 and smaller in diameter than the eye. The mouth is broad ; the 

 tongue large and subcordiform, broadest posteriorly, deeply emargi- 

 nated, and free upon the half of its length. The maxillary teeth are 

 very small ; inconspicuous though acute. The vomerine teeth con- 

 stitute two oblong groups, situated between and a little behind the 

 inner nostrils, nearer the latter and closer to one another, than in R. 

 aurora. The inner nostrils themselves are transversely oblong, rather' 

 small, whilst the tubes of Eustachi are quite large, and, therefore, 

 more conspicuous. 



The body is rather short, and subcylindrical in shape. The legs, 

 as already stated, are proportionally much smaller than in R. aurora, 

 whilst the fingers are longer, more slender, and tapering. The inner 

 one is very fleshy upon its origin ; it is longer than the second, and 

 shorter than the third, which is the longest; the fourth, or outermost, 

 is slightly longer than the second. Two horny protuberances are 



