186 



Charles Searing Mead. 



diagonally downward and forward, and, converging, end freely just 

 dorsal to the anterior end of the corpus hyoideum. They do not unite 

 with this till later. The same is true in Homo and Lepus embryos. 

 From this circumstance Kolliker (Gaupp, 1905 b, p. 836) thinks 



I. par 



ph. n.c. 



Fig. 5. Section showing the notochord leaving the pharynx. x 10. 



VIII, nervns acusticus ; VII, nervus facialis ; cli.ty., chorda tympani ; c.a.m., 

 external auditory meatus ; tym.c, tympanic cavity ; ph., pharynx ; hyo., 

 cornu hyale ; n.c, notochord ; coch., ridge which forms the inner part of the 

 cochlea; man. in., manubrium malleus; I. par., lamina parietalis; pa., anlagen 

 of parietal bone. 



that the hyoid arches (hyalia) take no part in the formation of 

 the corpus hyoideum. The corpus hyoideum is broadly U-shaped with 

 the opening anterior. This opening does not show well in the figure 

 on account of the angle at which it was drawn. Attached at each 

 side of the base of the U and curving diagonally outward and tlien 



