26 



THE ORIGIN OF VERTEBRATES 



1 



few 





»1& 



Fig. 97. — Teansveese Section theough the Olfactoey Passage of a Young 



Thelyphonus. 



1 and 2, sections of first and second appendages. 



--cart. 



Fig. 98.— Teansveese Section theough the Olfactoey Passage of Peteomyzon. 



cart., nasal cartilage. 



