192 



F. H. EDGEWORTH. 

 Text-fig. 20. 



.U n.k^ot-i. boJL 



Wv^oiA Wv 



Text-fig. 21. 



C.y^ 



■j.Lx 



21. 



Text-figs. 20 and 21. — Acipenser, embryo Sh iinii. Text-fig. 20 

 is the more anterior. The right side of the sections is slightly 

 anterior to the left. 



