MI ALL : BONES OF CTENODUS. 
291 
Fig. 2. — Acipenser. Superficial Cranial Ossifications. (Occipital Begion) x 4. 
Ptdato-pterygoid. This has been figured more than once, and 
Fig. 4. — Ctexodus obliquus. Palato-pterygoids, with teeth, x 
its resemblance to the same part in Ceratodus and Dipterus has 
been commented on.* Dr Traquair observes f that the division 
* Hancock & Atthey, N. H. Tr. N. & D., vol. iv., p. 405, pi. xiv. T. P. 
Barkas, Coal Measure Palseontology, Atlas, pi. x., figs, 247, 248. 
L. C. Miall, Q. J. Geol. Soc. , vol. xxx., p. 772. 
t Ann. Nat. Hist.. 5th ser., vol. ii., p. 6. 
