88 



PISCES. 



TELEOSTEI. 



Genus PERCA, Linnaeus. 



Peeca fluviatilis, linnmvs. 



{Perch.) 



(Vert. Forest Bed, p. 120, Plate XVIIl., Figs. 1-8.) 



Scales and parts of the opercular apparatus of this fish have 

 been found in the Forest-bed at West Runton, Beeston, Mundesley, 

 Happisburgh, Ostend, and Kessingland. 



Perca fiuviatilis has also been met with in Post-glacial Beds at 

 Hornsea, Yorkshire. (Mem. Geol. Surv., Geology of Holderness, 

 1885, p. 82.) 



The species is now living in the rivers of Europe and Asiatic 

 Russia. 



Genus ACERINA, Cuvier. 



ACERINA VULGAEIS?, CUVIEB. 



{Ruff.) 



vVert. Forest^Bed, p. 121, Plate XVIII., Fig. 9.) 



An otolith from the Forest-bed of West Runton has been 

 referred to this species. 



The Ruffle now living in the rivers of Europe and Siberia. 



Genus CHRYSOPHRYS,. Cuvier. 

 Plate X., Figs. 1, 2, 3. 



Certain smooth and polished fish teeth, wliich have lono- been 

 known from the Red Crag of Suffolk, have been labelled in 

 collections as Chrysophrys ; but I am not aware that the occurrence 

 of this genus in the English Crag had ever been published. These 

 teeth vary much in shape, corresponding, apparently, to the 

 different parts of the mouth which they have occupied, some 

 being elongated, conical, compreesed, and curved, while others are 

 short truncated cones, or even flattened discs like those ofP^cnodus. 

 One specimen m the Museum of Practical Geology consists of 



