CHAP. III. THE CRUISES 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. 
Adiga nasuta, NoRMAN (Fig. 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. 
Arcturus baffint, SABINE (Fig. 21), is another of 
the ‘isopoda normalia ’—normal to a certain extent in 
its structure, but very peculiar in its appearance and 
Fic. 20.—Aga nasuta, Norman. Slightly enlarged. (No. 55 
habits. Arcturus 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 antenne, and to these the young cling by 
their claspers, and range themselves along like a 
couple of living fringes. Jdotea (Arcturus) 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 Research, vol. i. p. 202. 
