ESPECIALLY MYCTOPHOIDS 129 
The supraoccipital is a small bone just appearing on the dorsal surface of the neuro- 
cranium. It is overlapped anteriorly by the frontals, and separates both the 
parietals and the epiotics. A small backwardly directed crest is produced which 
does not extend above the plane of the skull-roof. 
a.t.fic 
Fic. 57. Halec eupterygius (Dixon). Neurocranium in ventral view. 
