1904-1905-] Copepoda living as Parasites or Messmates. 203 



undescribed species. Though this species has been obtained 

 on several subsequent occasions, and more often free than 

 otherwise, I am inclined to believe that its true habitat is the 

 tubes of the Annelids referred to. For should the dredge pass 

 across any of these tubes it may easily dislodge the copepods 

 and bring them up " free " amongst the material collected. 



If the copepod I am now to speak of — Sahelliphihis Sarsi 

 Claparede — were endowed with the sense of what is beautiful, 

 it could hardly have made a better choice of a dwelling-place, 

 for it lives among the lovely plumes that adorn the heads of 

 certain marine Annelids, and especially of those belonging to 

 the genus Sabella. To see the copepods running about among 

 these feathery plumes reminds one of the free happy life of 

 the squirrel in its native forest. 



In Part III. of the Nineteenth Eeport of the Fishery Board 

 I have described a curious copepod found in a gathering of 

 small Crustacea sent to me from Loch Fyne by Mr F. G. 

 Pearcey. It was at the time entirely unknown to me, and I 

 gave it the name of Cancerina confusa. I had found only a 

 single female, which carried ovisacs, and it was the unusual 

 position these occupied that made the species somewhat 

 puzzling. Shortly after the description and drawing had 

 been published. Canon Norman informed me that this was 

 a species which Levinson had described in 1877 under the 

 name of Selioides Bolhroei, and he kindly let me see a speci- 

 men that Levinson had sent him, and which I found to corre- 

 spond exactly with that from Loch Fyne. Levinson describes 

 the species as living on Harmothoe imhricata, one of a group 

 of Annelids nearly related to the Sea -mouse (Aphrodite 

 aculeata), and found on our shores at the roots of sea-weeds 

 between tide marks and a little beyond. I may add that the 

 Sea-mouse itself is said to afford shelter and food to another 

 copepod, but this one I have not yet seen. 



Nereicola concinna T. Scott and Nereicola ovata Keferstein 

 are two species which, though different, have such a general 

 resemblance that they may easily be confounded unless care- 

 fully examined. Several specimens of the first were found 

 adhering to a fragment of a moderately common Annelid, 

 Eidcdia viridis, that lives on rocky shores between tide- 

 marks, and also in moderately deep water. This species is 



