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 (Pentaerinus) Off the mouth of the 
Fig. 400. — Astrocnida isidis. 4. 
Mississippi we brought up from 100 fathoms a number of Ophio- 
linus Agassizii (Fig. 401), which must live buried in the mud 
Fig. 401. — Ophiolipus Agassizii. 158, 
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): "°°" 
