70 



Journal of Comparative Neurology, 



Fig. ly. Transverse section of same stage taken obliquely along the line 

 17-17 of Fig. 15. X 160. 



Figs. 18 and ig. Transverse sections of the same stage taken along the 

 lines indicated by their numerals in Fig. 13. x 160. 



Fig. 20. Reconstruction of primary and secondary vesicles of larva 14-15 

 days old, (9-10 mm.) showing further shifting of the secondary vesicle, x 50. 



Fig. 21 . Sagittal section of the roof of the thalamencephalon through the 

 epiphysial region of the same stage, x 15. 



Fig. 22. Sagittal section of the epiphysial region of Fig. 21. x 125. 



Figs. 2j, 24, 2^, 26. Transverse sections of same stage taken along the 

 lines indicated by their numerals in Fig. 20. x 125. 



Fig. 2y. Sagittal section of the roof of the thalamencephalon through the 

 epiphysial region along median line in larva 19-20 days old, (12-13 mna-) x 15. 



Fig. 28. Sagittal section of the epiphysial region of Fig. 27. x 125. 



Figs. 2g, JO, ji, J2. Transverse sections of same stage along the lines in- 

 dicated by their numerals in Fig. 28. x 160. 



Fig. 3 J. Transverse section of same stage showing nerve fibers passing 

 from the superior commissure to the primary vesicle, x 160. 



Fig. j^. Sagittal section of the roof of the thalamencephalon through the 

 epiphysial region along median line in larva 22-26 days old (15-16 mm), x 15. 



Fig.jS' Sagittal section of the epiphysial region of Fig. 34. x 125. 



Fig. j6. Sagittal section of the secondary vesicle of the same series as 

 Fig. 35. X 125. 



Figs. 37, 38, J9, 4.0. Transverse sections along the lines indicated by their 

 numerals in Fig. 35. x 125. 



Fig. 41. Sagittal section of the roof of the thalamencephalon through the 

 epiphysial region along median line in larva 30-35 days old, (22-23 ™ni)« * 15- 



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