CHAP. III.] THE GItUISES OF THE ' porcupine: 127 



the genus Caprella, the odd-looking group of skeleton 

 shrimps which fix themselves by their hind claspers, 

 usually in this locality to branching sponges, and wave 

 their gaunt grotesque bodies about in the water. 



jEga nasuta, Norman (Pig. 20), is another new 

 species, one of the ' normal ' isopods. Much larger 

 specimens of this curious genus are however known 

 on the British coasts, usually semi-parasitical on large 

 fishes. 



Ardurus haffini, Sabine (Pig. 21), is another of 

 the 'isopoda normalia' — normal to a certain extent in 

 its structure, but very peculiar in its appearance and 



Fio. m.—JEcja, nasuta, Nobmah. Slightly enlarged. (No. 65. 



habits. Ardurus has, like Caprella, the habit of 

 clinging to some foreign body by its claspers, and 

 rearing up the anterior part of its body in a queer 

 manner ; but it has in addition a pair of enormously 

 developed antennae, and to these the young cling by 

 their claspers, and range themselves along like a 

 couple of living fringes. Idotea (Arcturm) baffini 

 was first described in the Appendix to Captain Parry's 

 fourth voyage. This, or a nearly allied species, 

 seems to occur also in the Antarctic seas. Sir James 

 Clark Ross remarks,' that in dredging at a depth 



' A Voyage of Discovery and Eesearch, vol. i. p. 202. 



