236 



narrow, iiiianiuHl at upprr border; wrisl elongate, more so in the right than in the left chela; 

 palm of right chela considerably higher and more inflated than that on the left side, with the 

 lower fmger somewhat deflexed, and lingers widely gaping at base, but meeting in their distal 

 half, where the opjiosite margins are finely toothed; left chela (fig. 3<) low, upper margin of 

 palm shorter than movable finger, lower finger deflexed, fingers narrowly gaping, elongate, 

 movable finger with the inner margin irregularly cut, but without distinct teeth, fixed finger 

 with two prominent spiniform, erect teeth in the distal half, followed by 



2 ^ obtuse crenulations towards the tip and preceded 1)\ a row of vcr\- minute, closely-crowded 



senulalions, becoming nu)re or less obliterated with age. 



Walkino- legs slender, miiidle pairs twice as long as carapace, last three joints heavily 

 friu'-ed, liairs especially long along hind (inner) margin of ])ropodite and dactylus. Meropodite 

 cylindrical, unarmed; ilactxli straight, blade-like, much compressed, those of first and second pair 

 subecpial and longer than lliose of third pair, dactyli of last pair slender, elegantly curved backward. 

 l'"irst alnloininal .segment of cT (fi.g- 3'0 linear, occupying about one-third of the interspace 

 between the last pair of legs, second segment less broad, third segment much longer, projecting 

 laterally as far as first segment, but completely fused with fourth and fifth segment, penultimate 

 segment ilistinctly shorter than terminal one, which is of an oblong shape. 



The general colour oi' the animal is of a uniform milky-white, but the pubescence is 

 greyish-white or dusky-brown; the surface of the walking legs is thickly pubescent in some 

 inilividuals, but in others entirely hairless. The carapace is sometimes covered with minute 

 reiUlish dots. 



The specimens of the "forma W (fig. 3*') are, without exception, much smaller, the largest 

 individual i^Stat. 312) measuring only 5.4 mm. across the carapace; except this specimen all 

 were taken iVom much shallower depths (70 — 90 metres). This form is i.listinguished by the 

 following points : 



i" The carapace is somewhat less pubescent; the eye-stalks are visible plainly from above; the 

 eyes are entirely absent. In the shape of the front the same variation occurs as in the 

 individuals of "forma .A", the anterior margin being straight or faintly bilobed (fig. 3/). 

 2" Antennulae shorter, last joint of peduncle thicker (fig. 3/). 



3" External maxillipeds rather widely difterent tVom those of "torma A" (compare figs, ^fi 

 and 3,!,'): ischium narrower, merus of a much more slender shape, oblong, as 

 long as ischium and not b u 1 g i n g o u t w a r d ; terminal joint of palp very short, scarcely 

 one-third of length of preceding joint. 

 4" l-^i.^^lil (kirger) chela agreeing with that of "forma A", but loft chela diftering in having the 

 whole inner margin of the fixed finger provided with the closely-crowded, 

 plate-like and high serrul a t ions, found in the proximal half of that finger 

 in "torma A", but here generally more or less obliterated (fig. 3//). The opposite margin 

 ol the mobile finger is unarmed, save for a rather large, truncated tooth quite near the 

 base; this tooth, however, is wanting in some individuals. 

 5* The abdomen of the cT (fig. 3') resembles that of "forma A", but the penultimate segment 

 IS not shorter than the terminal one, which is as long as broad at the base. 



S8 



