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. (Kays.) 



Family 108.— PRISTHLE. (1 Genus, 5 Species.) 

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

 Distribution. — Seas of tropical and sub-tropical regions. 



Family 109.— RHINO BATID^E. (3 Genera, 15 Species.) 



" Pays 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 Rata are found on our coasts. 



