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FISHES. 



Teeth obtuse, granular, the dental surfaces of the jaws being 

 undulated. 



Two species, Eh. ancylostomus and Bh. djeddensis, are very 

 common on the tropical coasts of the Indian Ocean. They 

 feed on hard-shelled animals, and attain scarcely a length of 

 8 feet. 



Ehinobatus. — Cranial cartilage produced into a long rostral 

 process, the space between the process and pectoral fin being 

 filled by a membrane. Teeth obtuse, with an indistinct trans- 

 verse ridge. Dorsal fins without spine, both at a great distance 

 behind the ventral fins. Caudal fin without lower lobe. 



Numerous on the coasts of tropical and sub-tropical seas ; 

 about twelve species. Trygonorhina is an allied genus from 

 South Australia. 



The oolitic genus ^athobatis is scarcely distinct from 

 Bhinohatus; and another fossil from Mount Lebanon has 

 been actually referred to this latter genus. Trigorhina from 

 Monte Postale must be placed here. 



Thied Family — Toepedinid^. 



Tlie trunk is a broad, smooth disk. Tail with a longitudi- 

 nal fold on each side ; a rayed dorsal Jin is generally, and a 



