Marsh Collection, Peabody Museum. 



165 



hog, figure 100. He says :■* " The course of the internal caro- 

 tid artery is remarkable. When it reaches the base of the 

 skull it enters the tympanum and there divides into two 

 branches, of which one traverses the stapes, and, passing for- 

 ward in a groove of the roof of the tympanum, enters the 

 skull and gives rise to the middle meningeal and ophthalmic 



100 



Figure 100. — Enlarged view of the base of the skull of Erinaceus europceus ; 

 showing the foramina. 

 fo, foramen ovale ; flm, foramen lacerum medium ; ec, eustachian canal ; 

 pgf, postglenoid foramen ; smf, stylomastoid foramen ; cc, carotid canal ; 

 flp, foramen lacerum posticum ; cf, condyloid foramen. 



arteries. The other branch passes over the cochlea, enters the 

 skull by a narrow canal near the sella turcica, and unites with 

 the circle of Willis." 



This course and distribution of the entocarotid is not only 

 characteristic of the hedgehog, but is also found in the follow - 



* Anatomy of Vertebrated Animals, 1872, p. 380. 



