Chiltok. — On New Zealand Squillidse. 65 



triangular ; the inner edge is sinuous, being convex in proximal 

 half, and afterwards shghtly concave, the whole of it being 

 densely fringed with long, very finely plumose set® ; these be- 

 come somewhat smaller towards the distal end, but there is a 

 tuft of longer ones again at extremity of the joint ; the outer edge 

 is curved, and fringed with seta? similar to those on the inner 

 margin ; towards the base these set® are short, more spiniform, 

 and not so numerous. Tliis basal joint is divided into two parts 

 by an oblique suture running from the outer corner of the base 

 across the joint to the inner distal angle. It would appear 

 that the outer distal portion thus separated off is to some ex- 

 tent movable, as three narrow muscular bands arising from 

 the same muscle that supplies the movable limb of the forceps 

 extend as far as the suture. There is a small tuft of 5-6 

 simple setse on the surface of the joint on the proximal side of 

 the suture. The terminal joint, B, of the appendage is divided 

 from the basal joint by a nearly transverse suture ; it consists 

 of the inner lobe, b, and the outer lobe, a. The latter is con- 

 siderably longer than the former, from which it is completely 

 separated, and is very different from it in shape, but is not 

 larger; it is subtriangular, articulating to the basal joint by 

 a very narrow base ; it expands distally, and has the end 

 regularly rounded ; the outer edge is smooth, but the end and 

 inner margin are densely fringed with long plumose setae, the 

 outer ones being the longest. The inner joint is partially over- 

 lapped by the outer, and is irregularly circular in outline. 

 The retinaculum is distinctly marked, it ends acutely, and 

 has nearly the whole of the inner margin densely covered 

 with the characteristic curved seise. The movable limb of 

 the forceps, /, is long, curved outwards, and ending acutely 

 in two pomI:s; the fixed limb, e, is small, rounded at the end, 

 and apparently curving outwards from the joint, but not 

 hooked. 



Secondary sexual differences between the sexes appear to 

 be rare among the Stomatopoda, though Brooks records slight 

 differences in Ltjsiosquilla macnlata. Differences in colour 

 are more common. Brooks states that the male of Pseudo- 

 squilla ciliata is said to be more brilliantly coloured than the 

 female, and that the female of Lysiosquilla cxcavatrix is larger 

 and darker than the male. Of Lysiosquilla spinosa I have 

 seen one female only, all the rest being males ; but, as the 

 males were all closely alike in colour, and differed markedly 

 from the female, I am inclined to think that the difference is 

 normal : and it is worthy of note that in this species, unlike 

 Pseudosquilla ciliata, it is the female that is more brilliantly 

 coloured. In this specimen the thorax and abdomen are also 

 slightly broader in proportion than in the male (see measure- 

 ments below) ; but whether this is accidental or normal I cau- 

 5 



