34 



F. W. THYNG 



Text fig. 1 Human embryo of 17. S mm. (H. E. C. 839). 

 Minot).2 



X 5 diams. (after 



elevation there is a shallow depression, said to disappear in the 

 course of development. 



A distinct groove, extending transversely l)etween the medial 

 angles of the developing eyes, separates the forehead from the 

 root of the nose. The maxillary process of either side has joined 

 the adjacent lateral and median nasal processes, obliterating the 

 naso-optic grooves. The nares are open, but separated by a 

 rather low, broad sei)tum. A triangular space still intervenes 

 between the globular processes so that the median region of the 

 upper lip is not well differentiated. The median groove between 

 the ventral ends of the mandibular arches has been obliterated, 

 but differentiation between the chin and lip regions has not 



'A reproduction of figure 104, ])age 153 of "Laboratory Textbook of Embry- 

 ology," Charles Sedgwick Minot, edition of 1910, published by P. Blakiston's 

 Son and Company, Pliiladclpliia. 



