PLATE VI. 



Fifl. Page. 



1 . Fji'/pidotiis Diiiior, Agassiz ; nearly complete fish, left side view, nat. size, 

 tlie left side of the head slightly displaced upwards, the ventral 

 region of the trunk crushed downwards, and the dorsal ridge-scales 

 lacking. — Middle Purbeck Beds; Swanage, Dorset. Museum of 

 Practical Geology, London, no. 27975. hr., branchiostegal rays ; 

 CO., circumorbitals ; iop., interoperculum ; »«(/., two rami of mandible, 

 the left crushed upwards ; inx., maxilla, capped by supramaxilla ; 

 orb., orbit ; pnix., premaxilla ; po., postorbital ; pop., preoperculum ; 

 pro., preorbitals ; .soj)., suboperculum. 28. 



