528 C. JUDSON HERRICK 



EXPLANATION OF FIGURES 



51. Section 402 from the same series as fig. 50, taken 11 sections from the sagti- 

 tal plane . X 15. 



52. A parasagittal section through the brain of a specimen of Lacerta vivipara 

 (?) with a total length when uncoiled of about 36 mm. (head 5 mm. long). Har- 

 vard Embryological Collection, series 603, section 201. X 24. On this figure is 

 indicated the approximate planes of figs. 53 to 57. 



53 to 57. A series of sections through the brain of a specimen of Lacerta vivi- 

 para (?) of about the same age as the one last figured. Harvard Embryological 

 Collection, series 604. X 24. For planes of sections, see fig. 52. 



53. Section through the anterior commissure. 



54. Section immediately ventrally of the interventricular foramen. 



55. Section through the interventricular foramen. 



