1916. | S. Kempe: Notes on Crustacea Decapoda. 363 
The third maxillipedes reach almost or quite to the end of the 
antennal scale. The combined length of the two subequal distal 
segments is not greater than that of the antepenultimate. The 
latter seginent bears a few small spinules at the distal end of its 
lower. margin and the exopod, when naturally flexed, reaches but 
little beyond the middle of its length. 
The first peraeopods (text-fig. 2c) reach a little further than 
the third maxillipedes. The merus at its outer distal angle bears 
three stout curved spines and there is a single external spine near 
the distal end of the carpus. The subchela is a little more than 
three times as long as broad; the ‘‘thumb”’ is large and sharp as 
in P.incisus. The first legs are separated at their base by a large 
forwardly directed sternal tooth. 
The second peraeopods (text-fig: 2d) are clothed with long 
hairs and reach beyond the carpus of the first pair; the merus is 
as long as the carpus and chela combined, the carpus is one and a 
third times the length of the chela and the fingers are a little less 
than one and a half times as long as the palm. Each finger bears 
a slender spine at its apex, but the spines are not curved and the 
claw is apparently without cutting edges. The fixed finger is a 
little broader than the dactylus. 
The third peraeopods reach beyond the antennal scale by the 
length of the two ultimate segments. The proportions are much 
the same as in P. incisus, but the propodus and dactylus are com- 
paratively a trifle longer, their combined lengths being almost three 
quarters that of the carpus. 
The fourth and fifth pairs bear scattered setae on the propo- 
dus. The fifth reach beyond the scale by about half the length of 
the dactylus. The propodus in this limb is two and a half times 
the length of the carpus and is a quarter longer than the subequal 
merus and dactyius. Seen under a high power of the microscope 
the anterior margins of the merus and carpus have a roughened 
appearance, as though they were studded with small tubercles. 
The abdomen in a dried specimen shows faint indications of 
sculpture, very shallow transverse grooves and elevations being 
visible on the first four segments. In the posterior half of the 
second somite and over the greater part of the third and fourth 
there are sharp longitudinal mid-dorsal carinae. Those on the 
secord and third somites are simple, but that on the fourth is 
longitudinally grooved in the middle and thus has the appearance 
of a double carina fused at either end. There are two short dorsal 
carinae on the fifth somite and a pair of similar widely-separated 
carinae, which are exceedingly obscure, on the sixth. The pleura 
are not pointed inferiorly. 
The pleopods of the male resemble those of P. incisus, the 
endopod of the last four pairs is well developed and carries an 
appendix interna. In the female, asin P. incisus and P. sculptus, 
the endopod is greatly reduced and the appendix interna, found in 
those species in a rudimentary condition on the second, third and 
fourth pairs, is entirely suppressed. 
