296 



MISS EBITH E. BAMFORD ON THE 



Fins with Forked lladials only. 



Fins with Incomplete Radials only. 



In the eight fins where both forked and incomplete radials 

 wei-e found this was their position on the mesopterygium : — 



It will be seen that the third radial is most frequently forked 

 and that the incomplete radials most frequently occur between 

 radials 3, 4 and 5. From this position there is a gradual decrease 

 in the frequency of the occurrence of forked and incomplete 

 radials on either side. The region where these forked and 

 incomplete radials are most usually found is the distal projection 



