762 



Bashford Dean Memorial VoJume 



In the present article, the structure of the adult teeth of Heterodontus has been 

 described for every species except japonicus. Teeth of young specimens (after hatching) 

 have been described for every species except galeatus. Teeth of an embryo of Hetero- 

 dontus have not been described for any species. 



Upon comparing the accounts, by various authors, of the teeth of the six species of 

 Heterodontus, it seems to the v.Titer that the specific differences are not very great and 



Test-figure 69 

 Roof of the mouth of a 280mm. (11-inch) young Heterodontus japonicus, showing teeth 



of the upper jaw. 

 From a drawing left by Bashford E>ean. 



