238 UPPER CRETACEOUS TELEOSTS 
forms and ostariophysans (the basal forms within the Protacanthopterygii). A 
possible reason for the absence of this ancestral stock and for the apparent absence 
of Salmoniformes before the Lower Cretaceous, and of Ostariophysi before the 
S.pop 
Pholidophorid 
witha 
separate 
suprapreoperculum 
? 
Outline restorations of certain halecostome and teleost skulls to indicate possible 
(A) Pavasemionotus labordei. After Gardiner (1960). (B) Pholidophorus 
(c) Leptolepis novmandica. After Nybelin (1962). 
After Nybelin (1962). (E) Megalops cyprinoides. 
FIG. 99. 
relationships. 
bechei. After Nybelin (1966). 
(p) Leptolepis coryphaenoides. 
(F) Salvelinus sp. 
