462 GEOGRAPHICAL ZOOLOGY. [PART iv 



FAMILY 106. RHINID^E. (1 Genus, 1 Species.) 



" Sharks with depressed flat body and large expanded pectoral 

 fins." 



DISTRIBUTION. Temperate and tropical seas, from Britain to 

 California and Australia. 



FAMILY 107. PRISTIOPHORID.E. (1 Genus, 4 Species.) 



" Sharks with produced flat snout, armed with teeth on each 

 edge." 



DISTRIBUTION. Seas of Japan and Australia. 

 Sub-order BATOIDEI. (Rays.) 



FAMILY 108. PRISTHLE. (1 Genus, 5 Species.) 

 " Rays with produced snout and lateral saw-like teeth." 

 DISTRIBUTION. Seas of tropical and sub-tropical regions. 



FAMILY 109. RHINOBATID^E. (3 Genera, 15 Species.) 



" Rays with long and strong tail, having a caudal and two 

 dorsal fins." 



DISTRIBUTION. Tropical and sub-tropical seas. 



FAMILY 110. TORPEDINID.E. (6 Genera, 15 Species.) 

 " Rays with broad smooth disc, and an electric organ." 



DISTRIBUTION. Tropical and temperate seas, from Britain to 

 Tasmania. 



FAMILY 111. RAIID^E. <4 Genera, 29 Species.) 

 " Rays with broad rhombic disc and no serrated caudal spine." 



DISTRIBUTION. All temperate and tropical seas. Several 

 species of Raia are found on our coasts. 



