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Charles Searing Mead. 



mals lies, in the reptiles, on the outside of the brain-case above the 

 processus basipterjgoideus (ala temporalis). A large number of 

 facts support this view, among which I will only briefly refer to 



fen.a.p 



Fig. 7. Section through the region of the ala temporalis. X 10- 

 III, nervus oculomotorius ; IT, nervus trochlearis ; g.scmi, ganglion semi- 

 lunare; hyp., hypophysis; YI, nervus abducens ; n.p.s.m., nervus petrosus 

 superficialis major ; T', branches of trigeminal nerve, together with the chorda 

 tympani ; Til, nervus facialis; 7/?/o., corpus hyoideus and coruu hyale ; M. c, 

 Meckel's cartilage; scl.t., sella turcica; pr.aL, processus alaris; ala t., ala 

 temporalis; fen. s. p., fenestra spheno-parietalis ; r.o.p.. comniissura orbito- 

 parietalis. 



the following: (1) the long course within the mammalian brain 

 cavity of the oculomotor, trochlear, abducens and first two branches 

 of the trigeminal nerves, which perforate the dura mater at ap- 

 proximately the same points as those at which they leave the cranial 



