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 Echinoderms, was made by Dr. Grave ; and the 

 results which are here detailed are his work. 



W. K. BROOKS. 



