120 
a longitudinal black band. The ground-colour of the ventral side is 
greyish blue with a row of large, whitish (discoloured?) spots in the 
median line, between the base of each pair of legs; the pads of 
the legs are concolourous with the underside of the body. Of the 
females three have 25 and the other three 24 pairs of legs, whereas 
in the males the number of legs varies between 22 and 23. With 
regard lo the number of legs P. keiensis much agrees with P. novae- 
britanniae, which has 24 pairs in the ^ , and 22 pairs in the 
3 . 
Fig. 1. Inner jaw-blade, X 110. — Fig. 2. Outer jaw-blade, X 110. — Fig. 3. Dorsal 
view of the posterior end of the male, enlarged. 
cf'. Each leg has three spiniferous pads, the distal and the prox- 
imal one nearly of the same breadth, half as broad as the med¬ 
ian one; there are vestiges of a fourth one. The renal papil- 
lae of the 4th and 5th pairs of legs are connected with the middle 
of the proximal pad. The mouth is surrounded by a ring of bluish- 
white lobes, about seven on each side; they are wedge-shaped 
and set with spines. The inner jaw-blade besides the main tooth 
possesses eight accessory denticles, without diastema; this is a 
rather great number, also met with in P. stresemanni Bouv.^), 
1) Zoolog. Mededeel. R. Museum Natuurl. Historie, Leiden, dl. 111, 1917, p. 263. 
