ACTINOPTERYGir. 
496 
Fig. 18. 
Outlines of Eostra of Extinct Xiphiidae. 
1. Xiphiorhynchus 'priscus^ upper aspect and transverse sections (1 a-c), 
one half nat. size.—London Clay; Sheppey. 
2. Histiophorus eoccBniciis ; upper aspect and transverse section (2 a), one third 
nat. size.—Middle Eocene ; Bracklesham. 
3. Histiophorus rotundus ; upper aspect and transverse section, one third nat. 
size.—Tertiary Phosphates ; South Carolina. 
