As my name appears upon the title-page of this memoir, it is proper for me to state that my 

 share in the work has been that of the instructor under whose direction the work has been done. 

 The discovery that this Ophiuran is of peculiar interest and that it is unusually favorable for the 

 study of the problems of the morphology of Echiuoderms, was made by Dr. Grave; and the 

 results which are here detailed are his work. 



W. K. BKOOKS. 

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