1911.] 



NATURAL SCIENCES OF PHILADELPHIA. 



499 



similarly inclined, but very slightly convex. Snout moderately 

 long, protruding slightly below closed mandible tip, length about 

 | its basal width, and surface evenly convex. Eye slightly ellipsoid, 

 its centre level with snout tip and a little before middle in head 

 length. Pupil slightly ellipsoid in vertical. Eyelid very narrow, 

 free, not adipose-like. Mouth peculiar, large, and commissure very 

 deep, extending back not quite opposite front pupil edge, though 

 beyond front eye margin. Maxillary straight, of rather narrow 

 and uniform width, well inclined back till its tip opposite hind eye 



Fig. 2. — Rhoadsia altipinna Fowler. Type. 



edge, and most its whole length free from the corresponding straight 

 infraorbital edge. Mandible long, rami incised or emarginated 

 in front, giving a chisel-like appearance. Rami also attain their 

 greatest height anteriorly or opposite a corresponding notch in front 

 of maxillary, after which they are continued back to their articula- 

 tions of uniform height. A single series of compressed sharp teeth 

 form cutting edge in front of upper jaw, consisting of 6 teeth each 

 side. Each tooth with a median and slightly enlarged pointed cusp 

 followed by 2 smaller ones each side, latter usually subequal. Front 



