RAYS. 



J47 



cur in the ISTorwicli Crag and in Miocene formations of 

 Switzerland. 



DiCEROBATiS (Cephaloptera). — Cephalic appendages point- 

 ing straight forwards or inwards. Nostrils widely separated from 

 each other. Mouth inferior, wide. Both jaws with very nume- 

 rous and very small flat or tubercular teeth. Tail very sleuder, 

 with a dorsal fin between the ventrals, and with or without a 

 serrated spine. 



Ceratoptera. — Cephalic appendages pointing forwards or in- 

 wards. Mouth anterior ; wide. Teeth in the lower jaw only, 

 very small. Tail very slender, with a dorsal fin between the 

 ventrals and without spine. 



The species of these two last genera are not yet well dis- 

 tinguished : about five of Dicerohatis and two of Ceratoptera 



i'om Misol. 



are known from tropical and temperate seas, but their occur- 

 rence in the latter is rather sporadic. Some of them, if not 

 all, attain an enormous size. One mentioned by Eisso, taken 

 off Messina, weighed 1250 pounds. Several observers speak 

 of having seen them in pairs, the male being usually the 

 smaller. Of a pair mentioned by Pdsso the female was first 

 taken, and the male remained hovering about the boat for 



