MI ALL : BONES OF CTENODU8. 
293 
The best example of a parasphenoid in position which I have yet 
seen is a Newsham specimen now in the Leeds Museum, which has 
been figured by Mr. T. P. Barkas * and by myself.f Its relation 
to the palato-pterygoid is almost precisely the same as in Dipterus 
Fig. 5. — Cehatodus. Parasphenoid and I'alato-pterygoids, from Giinther, 
Phil, Trans., vol. 1C1, pt. 2. pi. xxxiv fig. 3 x 4. 
and Ceratodus. The broad rhomboidal plate is anterior, and lies 
between the palato-pterygoids, while the manubrium, or handle, 
is posterior, extending beneath the skull and probably, as in 
Ceratodus, underlying the fore part of the vertebral column also. 
Squamosal. The bone which I regard as squamosal has 
Fig. 6. — Ctenodus. Right Squamosal, x |. 
occurred more than once. The best example I have seen is in 
Mr. Davis' collection. The long, slender process probably ex- 
* Atlas, pi. x., lig. 247. 
t Q. J. Geol. Soc, vol. xxx. (1874), p. 772, pi. xlvii. 
