CHAP. IV. ] THE CRUISES OF THE ‘ PORCUPINE, as 
We took one or two small examples of a very fine 
ophiurid, of which larger specimens had been pre- 
viously found at about the same depth and tem- 
perature during the second cruise of the same 
season off the coast of Ireland. This form probably 
ought to be referred to Lyman’s genus Ophiomusium, 
Fic. 33.—Ophiomusium lymani, WYVILLE THomson. Oral surface. 
though the characters of the genus must be some- 
what altered to admit it. Ophiomusium eburneum, 
LyMAN, of which several specimens were taken by 
Count Pourtales at depths of from 270 to 335 
fathoms, off Sandy Key, is distinguished by the 
great solidity and complete calcification of the 
