CHELURA. 203 



feet imperfectly cheliform ; tenth segment from the head 

 produced into a large spine posteriorly. 



This species was known to Dr. Leach, as there are speci- 

 mens from the English coast in his collection in the British 

 Museum. According to Professor Allman, Messrs. Mullins 

 and Ball first found it in Ireland, in excavations formed in 

 the timber piles of the jetty in Kingstown Harbour, near 

 Dublin. 



Major Martin found it at Ardrossan, and Mr. Spence 

 Bate at Plymouth. 



On its habits, Professor Allman* observes as follows : — 

 " Chelura terebrans is an active little animal, swimming on 

 its back, and employing its thoracic legs to adhere to the 

 timber which it has selected for its ravages. The large la- 

 mellar appendages, placed near the anterior end of the great 

 abdominal trunk, do not appear to be employed in swim- 

 ming, they are kept thrown upwards on each side of the 

 spinous process of the third abdominal segment, and seem 

 in no way subservient to locomotion ; they are not confined 

 to any particular sex, and it is difficult to assign to them 

 any office, unless it be that of keeping the excavations 

 formed by the amphipod free from the detritus of the 



* Ann. and Mag. Nat. Hist. vol. xix. pp. 367, 368. 



