42 WATSON & Day, Notes on some Palceozoic Fishes. 



show that except for the fusion of parietals and of a small 

 anterior pair of elements the two match bone for bone, 



A. 



B. 



Text-fig. 9.— Dorsal views of^the skulls of:— A., a primitive 

 Dipterus with the circumorbitals, maxillae, pre -maxillae, etc., omitted. 

 Slightlv schematic from No. L. 8 4 47 5 B., a primitive Rhipidistian 

 {Osteolepis with the supra-orbital of Glyptopomus inserted) ; C, a 

 primitive Stegocephalian with all the bones known to occur in the 

 skulls of members of that group. Reference letters as before, with :- 

 I.Fr., Interfrontal ; LNa, Inter-nasal. (Interfrontal known in 

 Eryops, etc Inter-nasal in Micropholis.) 



except that two small bones which lie on the extreme 

 outer sides of the roof of the skull in Dipterus and which 



