KAYS. 



347 



cur in the Norwich 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 slender, 

 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 



Fig. 134. — Dicerohatis draco, from 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 Eisso the female Was first 

 taken, and the male remained hovering about the boat for 



