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' 55 ' 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. 
