MORPHOLOGY OF THE VERTEBRATE SKULL 9 
dence for homology with the mammalian alisphenoids is very 
strong. ; 
Likewise in crocodiles (fig. 7) and Dinosaurs (figs. 8-10) the 
bones usually called alisphenoids, but called by von Huene ‘orbi- 
oc.stn. |VIV IW I I 
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Fig. 7 Median section of the Crocodile skull. 
. Foramina identified with the kind assistance of Dr. F. von Huene. 
The alisphenoid (marked O.s.) aggrees with the mammalian and Cynodont alisphenoid in being an- 
terior to the prootic and foramen prooticum (V), lateral to the basisphenoid and pituitary fossa, inferior 
to the parietal, and chiefly posterior to the foramina for nerves II, III, IV. 
Pa. sp., presphenoid (preformed in cartilage). 
tosphenoids’ are anterior to the prodtics, lateral to the basisphe- 
noid and pituitary fossa, inferior to the parietals and notched or 
pierced posteriorly by the foramen for nerve V3, they are also 
chiefly posterior to the exits of nerves II, III, and IV. In the 
inferior view of the skull the alisphenoids embrace the basi- 
