CHAP, iv.] THE CRUISES OF THE 'PORCUPINE: \ 73 



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 Ly man's genus Ophiomusium, 



FIG. 3'3.Ophiomusium lymani, WYVILLE THOMSON. Oral surface. 



though the characters of the genus must be some 

 what altered to admit it. OpMomusium 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 



