CTCLOPIOERA. 67 



cilia on the middle of each margin ; caudal appendages 

 about as long as the last abdominal segment ; longest 

 setse equal in length to the abdomen. 



One specimen was found amongst algse in tidal pools 

 at Roker, near Sunderland ; and a few were dredged 

 in Lough S willy, in a depth of about eight fathoms, 

 amongst muddy sand. Found also by the Rev. A. M. 

 Norman upon Echinus esculentus in Shetland. 



This does not differ very materially from G. nigripes, 

 except in the number of antennal joints and the cha- 

 racter of the fifth pair of feet and abdominal segments, 

 which are rounded and not at all angular. The 

 animal is also less robust and colourless. I am not at 

 all sure that it may not be an immature form of 

 Artotrogus {Ascomyzon) Lilljehorgii, the development of 

 which has not, as yet, been accurately observed. 



■Ascomyzon echinicola, Norman, while differing in 

 form of mouth and mandibles from the typical Asco- 

 myzon, seems to agree with Gyclopicera lata, so far as 

 I can make out from the type-specimens kindly lent 

 me by Mr. Norman. In this case, though the specific 

 name echinicola has the claim of priority, it is, I 

 think, inadmissible, the animal being certainly by no 

 means always, or even, perhaps, very commonly, para- 

 sitic on Echini. For the present, at any rate, it 

 seems to me best to consider the species identical 

 with C. lata, and to accept that name. 



