10 B A TRACK I A. 



Fig. 27, exhibits the under surface of the same animal. 



Fig. 28, is a view of the head from 'above, showing the distance 

 between the eyes. 



Fig. 29, a profile of the head, showing the undulated cleft of the 

 mouth. 



Fig. 30, is a front view of the head. 



Fig. 31, the inferior floor of the mouth, showing the tongue. 



Fig. 32, the upper floor of the mouth, exhibiting the patches of 

 sphenoid teeth, the disposition of the vomero-palatine ones, and the 

 inner nostrils. 



Fig. 33, a somewhat magnified view of a fragment of skin, exhibit- 

 ing the granules it contains. Under a higher power, these granules 

 are irregularly star-like in shape. 



GENUS HEREDIA, GIRARD. 



CAR. GEN. Gapite subelHptico, et quam corpus ampliore ; rostro obtitso, 

 rotund if or mi, ultra maxillam inferiorem protrudenie. Otis rictu 

 obliquo, rectilineari. Dentibus maxillaribus minutissimis, vixque 

 visib'dibus. Dentibus vomero-palatinis in duplicem arctim acutam, 

 qui ex splienoidalis extremitate anteriore per palati marginem pos- 

 teriorem extendunt atque e naribus interioribus aperturam angustam 

 efficiunt, dispositis. Dentibus sphenoidalibus in duas areas oblongas 

 ordinatis. Lingua ampla, eUiptica, centrali quadam radice fixa, 

 tertiaque ejus parte posteriore libera manente. Oculis magnis. 

 Cruribus gracilibus, anterioribus longioribus ; digitis palmarum 

 quatuor, plantarum quinque, omnibus distinctis et attenuantibus. 

 Gauda subcylindrica, paulum compressa, in extremilate gradatim 

 minuente. Gate externa Icevi et molli. 



GEN. CHAR. Head, subelliptical, broader than the body. Snout, 

 blunt and rounded; protruding beyond the lower jaw. Cleft of 

 the mouth, oblique and rectilinear. Maxillary teeth exceedingly 

 minute, scarcely perceptible. Vomero-palatine teeth disposed upon 

 a double ogive, extending from the anterior extremity of the 

 sphenoid, along the posterior edge of the palatine floor, thus 

 making of the inner nostrils a circumscribed aperture. Sphenoid 

 teeth forming two elongated patches. Tongue large, elliptical, 



