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iHcmoirs from tl]C Oiologicnl CaLunatoiy 



OF 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 tlie Memoirs of the Nation;il Academy of Sciences) 



BALTIMORE 



The Johns Hopkins Prkss 



1900 



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