THE 



BASHFORD DEAN MEMORIAL VOLUME 



ARCHAIC FISHES 



:r?,7;^V 



Gj«X 



Edited By 

 EUGENE WILLIS GUDGER 



Article VIII 



THE HETERODONTID SHARKS: 



THEIR NATURAL HISTORY, AND THE EXTERNAL 



DEVELOPMENT OF HETERODOKTVS JAFOKICUS 



BASED ON NOTES AND DRAWINGS 



BY BASHFORD DEAN 



By BERTRAKl G. SMITH 



Professor of Anatomy 



New York University Ck)llege of Medicine 



New York City 



NEW YORK 



PUBLISHED BY ORDER OF THE TRUSTEES 



Issued Oaoher 1, 1942 



