338 



E. R. HOSKINS 



Figs. 1 and 2 X 200. Longitudinal sections of the right dorso-lateral wall 

 of the post-valvular intestine through the anlagen of the digitiform gland of 

 Squalus acanthias embryos. 



Fig. 1 Embryo 15 mm. in length (H. E. C. 229). 



Fig. 2 Embryo 19 mm. in length (H. E. C. 138). . 



A.E., area of evagination of digitiform gland. 



