14 Mr. P. W. Bassett-Smith on 



considerably greater than the whole length of the thofax, at 

 others so short as to be scarcely visible. Both these con- 

 ditions occur in the mature female, the small immature 

 specimens often having long necks. The species described 

 as CJiondr acanthus gurnardi is probably one of these peculiar 

 forms with short necks. 



Brachiella insidiosa, Heller. (PI. VI. fig. 2.) 



These were found attached to the gill-rays of the hake, 

 Oadus merhiccms, being fairly common. The female agrees 

 very closely with that described by Heller (obtained from a 

 species of Gadus in the Mediterranean), except that the arms 

 are rather shorter and the cephalothorax is more acutely 

 bent. 



The male (PI. VI. fig. 2) is large, 3 centim. long, being 

 generally found fixed to the centre of the back. The anterior 

 part of the cephalothorax bearing the antennee and the mouth- 

 organs is distinctly separated off from the body, the latter 

 being distinctly segmented. 



Anterior antennse small, three-jointed ; posterior antennae 

 large and stout, placed behind the anterior, four-jointed (?), 

 bifid at the end, one branch being blunt and short, the other 

 terminating in a small dentate hook. Maxillae terminating 

 in two sharp-pointed flail-like branches, bearing a small palp 

 at the base. First maxillipeds with sharp acutely bent claw. 

 Second maxillipeds with a short blunt claw meeting a conical 

 tubercle. 



Brachiella merluccii, sp. n. (PI. VI. fig. 1.) 



These animals are always found attached to the poi'tits of 

 the gill-rakers of the hake, Gadus merlucciuSj and never 

 attached to the gill-rays themselves, as B. insidiosa. Both 

 were frequently found in the same fish, but their positions 

 were never other than that noted. 



Female. — Cephalothorax of moderate length, about equal 

 to that of the genital segment, tapering towards the head, 

 and bent forward in an obtuse angle. Head slightly widest 

 in front, the arms (second maxillipeds) not quite so long as 

 the cephalothorax, being united in the whole length by a 

 thin membrane. Organ of attachment a chitinous cup with 

 a short pedicel. 



Genital segment fiddle-shaped, very thick, carrying poste- 

 riorly two pairs of elongated processes ; a dorsal pair directed 

 backwards and outwards, and a ventral pair rising on either 

 side of an elongated filiform abdomen ("postabdomen,"Gerst.), 



