CHARACTERISTIC DEEP-SEA TYPES. OPHIURANS. 115 



trocnida (Fig. 400), cling to corals, gorgonians, and bryozoans. 

 One species, Ophiomitra valida, is often found twined round 

 the stalk of a sea-lily (Pentacrinus). Off the mouth of the 



Fig. 400. Astrocnida isidis. 



Mississippi we brought up from 100 fathoms a number of Ophio- 

 lipus Agassizii (Fig. 401), which must live buried in the mud 



Fig. 401. Ophiolipus Agassizii. 



brought down by the river. Worthy of spe- 

 cial notice is a small soft ophiuran which 

 came up in the very last cast made by the 

 " Blake " off Barbados. This seemed to 

 have little tufts resembling bunches of hy- 

 droids on the sides of the arms (Fig. 402) : 



