154 U.S. NATIONAL MUSEUM BULLETIN 2 88 



No parasphenoid teeth. Moderate-sized, somewhat ovate choanae 

 lying in the triangle between the vomerine and palatine teeth. Tongue 

 about one-third as wide as mouth opening, rounded, its posterior 

 border fused and unnotched. Snout arrow-head shaped, terminating 

 in a small fleshy proboscis about two millimeters in length, rather 

 flat and pointed in profile, the upper jaw extending about two milli- 

 meters (exclusive of proboscis) beyond lower; a short, fleshy appendage 

 at the base of each jaw; nostrils more superior than lateral, somewhat 

 projecting, their distance from end of snout about equal that from 

 eye, separated from each other by an interval equal to about one-half 

 their distance from eye. Can thus rostralis sharply defined but low; 

 loreal region very slightly concave and very oblique, the upper lip 

 flaring out strongly below it. Eye small, not prominent, its diameter 

 equal to its distance from nostril; interorbital distance equal to about 

 twice the width of upper eyelid, which is slightly greater than distance 

 between nostrils. Upper eyelid with a fleshy superciliary appendage 

 about one millimeter long. Palpebral membrane not reticulate. 

 Tympanum very distinct, nearly twice as high as wide, its long 

 diameter one-third again as great as diameter of eye, separated from 

 eye by a distance nearly equal to its width. Fingers with but a trace 

 of web at base, fourth finger considerably longer than second, reaching 

 to disk of third, which is not so wide as the narrow width of the 

 tympanum; no projecting rudiment of a pollex; ulnar ridge well 

 developed. Toes about one-fourth webbed, the web on fourth toe 

 reaching the middle of the preantepenultimate phalanx, third and 

 fifth toes subequal, disk of fourth toe covering an area about one-half 

 the diameter of disk of third finger; a distinct oval inner and a smaller 

 but equally distinct rounded outer metatarsal tubercle; a well- 

 developed tarsal ridge; a well-developed dermal appendage on heel 

 and another on knee. Body not elongate, in postaxillary region much 

 narrower than greatest width of head; when hind leg is adpressed, 

 heel reaches tip of snout; when limbs are laid along the side, knee 

 reaches to axilla; when legs are bent at right angles to body, heels 

 overlap considerably. No patagium present. Skin of upper parts 

 very finely granular, but the projecting neural spines of dorsal verte- 

 brae give the appearance of a median row of well-developed warts on 

 the back. The lateral margin of postorbital process of helmet makes a 

 shelf above the tympanum. Skin of throat and chest thin and smooth, 

 that of belly and lower femur very thin and very finely granular; no 

 skinfold across chest; no inguinal gland; no vocal sac apparent. 

 Skin of head not co-ossified with skull, roof of skull exostosed and 

 forming a well-developed casque. Helmet triangular in shape along 

 margin of the jaws, can thai ridges curve and meet between the 

 nostrils; above, the helmet terminates posteriorly in two well- 



