PLATE 17a. 



RHINOBATIDAE. 



Fig. 1-2. RnmoBATDa rasus (Page 270). Fig. .3-4. Rhinobato.s planiceps (Page 2.S3). 



1. Dorsal view of a specimen 14j inches long. 



2. Head from below. 



3. Dorsal view of a specimen 17| inches long. 



4. Head from below. 



