24 AMERICAN JOURNAL 



had been so long preserved in alcohol that the original colors are 

 destroyed. They are now of a dirty brown color with some 

 traces of purple, the surface, especially of the back, being closely 

 marked by small dark points. 



The species is allied most closely to 0. fusiformis, nobis, 

 Proc. Cal. Academy of Nat. Sciences, 1862, p. 171, but differs 

 in some details of outline, and markedly so in the relative lengths 

 of the arms ; the sessile arms of that species varying much 

 more in length, and the tentacles being nearly an inch and a 

 half shorter in an animal of the same size, than in cequifnanus. 



