PLATE 17a. 



RHINOBATIDAE. 



Fig. 1-2. Rhinobatus basus (Page 270). Fig. 3-4. Rhinobatus planiceps (Page 283). 



1. Dorsal view of a specimen 141 inches long. 



2. Head from below. 



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



4. Head from below. 



