ON MEGALICHTHVS 



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the other bones, and is expanded into a concave posterior 

 portion. Near each lateral edge of the roof of the cavity is a 

 relatively large perforation opening on to the dorsal surface of 

 the head. Each opening is surrounded by a slight elevation 

 of the bone. 



B8* is a smaller skull of Megalichthys hibberti exhibiting 

 the ventral aspect of the buccal cavity, and perhaps represents 



Text-figure I. Megalichthys hibberti. Part of skull ; inferior aspect. 

 Low Main, Newsham. Hancock Museum, B8. Natural size. (E. L. 

 Gill del.) 



a younger stage than B7* (ante). The posterior expansion of 

 the hindmost bone described in B7* is clearly seen. The 

 median dentiferous ridge appears to be more slender than in 

 the specimen previously described, and shews less differentia- 

 tion in width between its anterior and posterior portions. 



Perhaps the most important of the specimens of Megalichthys 

 in the Manchester Museum is that of a small portion of the 

 ventral surface of the body which shews the pectoral fins very 

 clearly and probably approximately in their natural positions. 



