CHAP. IV.] THE CRUISES OP THE 'PORCUPINE: 173 



We took one or two small examples of a very fine 

 opliiurid, of whicli 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, 



Fig, S3.~OpHoniusium lymani, Wtville Thomson. Oral surface. 



though the characters of the genus must be some- 

 what altered to admit it. Ophiomusium ebumeum,, 

 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 



