Memoirs from % Biological Caboratoij) 



OP THE 



JOHNS HOPKINS UNIVERSITY 



IV, 5 



WILLIAM K. BROOKS, EDITOR 



OPHIURA BREVISPINA 



A DISSERTATION PRESENTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY 



THE JOHNS HOPKINS UNIVERSITY 



BY 



CASWELL GRAVE 



(Reprinted from the Memoirs of the National Academy of Sciences) 



BALTIMORE 

 THE JOHNS HOPKINS PRESS 



1900 



