CHAKACTERISTIC DEEP-SEA TYPES. 



OPHIURANS. 



115 



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

 One species, OphiomUra vaUda, is often found twined round 

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



Fig. 400. — Astrocnida i.sidis, \. 



Mississippi we brought up from 100 fathoms a number of 0]jliio- 

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



Fig. 401. — Ophiolipus Agassizii. Ij^-. 



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) : 



