326 NOTES ON THE ECHlNODERMS 



Ophiobyrsa hystricis, Lym. 



It seems very probable that tlie remarkable Opliiurid to which I 

 refer in the introduction to my report ou Mr. Green's collection be- 

 longs to this species, but a close and extended investigation is re- 

 quired. Mr. Bourne's specimen is from Station 2. 



ECHINOIDEA. 

 CiDARIS PAPILLATA. 



Stations 2, 2>, and 4. 



Echinus acutus, Lamk. 

 Station 8. 



*ECH1NUS ESCULENTUS, Lin7l. 



Station 6. 



Echinus norvegicuS; D. and K. 



Station 2. This species was not collected by Mr. Green, and I am 

 very glad to be able to put it with those collected by him. 



Spatangus purpureus, 0. F. M. 



Stations 1, 2, 4, 5, 8 ; very abundant \, 2, 4. I should, after 

 what I have been able to see of the variations of this species and of 

 8. raschi, been particularly pleased had all the Spatangi from more 

 than 100 fath. been preserved. In suggesting the possibility of inter- 

 crossing between the two species I felt I was going beyond my record 

 for the time, inasmuch as I had not then evidence that 8. liur-pureAis 

 lived at depths as great or greater than 100 fath. 



HOLOTHUEIOIDEA. 



Holothueia tremula, Gunner. 

 Stations 1, 2, 4, 8. 



NOTE. 



Besides the Echinoderms above described I obtained three 

 Asterids which appeared to me to be very similar to Nymijliaster pro- 

 tentus, Sladen, described by Sladen in the ^'Challenger" Report of 

 the Asteroidea. But as I thought that I could distinguish some differ- 

 ences in my specimens, I sent them to Mr. Sladen for examination 



