22 



Resembling P. brachyura Calm., in general form except that the abdomen is more 

 slender. The lateral surface of the carapace has only three obHque ridges, the fourth which is 

 very slightly marked in P. brachyura being here absent. There are no strong teeth on the 

 dorsal surface, only a pair of small denticles on the ocular lobe and a few in front of the 

 anterior obHque ridge. The paired longitudinal crests on the posterior part of the dorsal surface 

 are finely serrated and more prominent than in P. brachyura, and the space between them is 

 deeply hollowed. 



The third and fourth leg-bearing somites appear to be fused or, at least, the line of 

 articulation between them is very slightly marked. In P. brachyura it is much more distinct. 



The lateral serrations on the abdominal somites are larger and more numerous than 

 in /'. brachyura. 



The telson resembles that of P. brachyura in size and shape. It has a pair of very 

 small apical spinules and two pairs of minute lateral setae. 



The antennules have the third segment of the peduncle longer and more slender than 

 in P. brachyura. 



The third maxillipeds (text-fig. 4^.) have the basis narrower than in P. brachyura. As 

 in that species they have no exopod. 



The first legs (text-fig. 4 f.) are much longer than in P. bracJixura, extending beyond 

 the tip of the pseudorostrum for a distance almost equal to the length of the carapace. The 

 distal segments are much more slender and the propodus is relatively a little longer. The exopod 

 is distinctlv shorter than the basis. The remaining legs are more slender than in P. brachyura. 

 The uropods are longer and more slender, the peduncle being three times as long as the sixth 

 abdominal somite and hearing about eleven spines on its inner edge. The rami have about 

 the same ratio to the peduncle as in P. bracJiyura but are slightly more unequal. The three 

 segments of the endopod bear each a single spine on the inner edge. 



Adult male. Total length 3,5 mm. (text-fig. 4^.). 



The carapace is less deep than in the female with the dorsal surface much less strongly 

 arched as .seen from the side. The posterior part of the dorsal surface is a little depressed in 

 the middle line between the slightly inflated branchial regions. There are three oblique ridges 

 on each side, less strongly marked than in the female. The broad ocular lobe bears three large, 

 strongly convex, transparent but ill-defined corneal lenses. 



The fourth and fifth leg-bearing somites are quite distinct. The lateral angles of the last 

 thoracic somite are very slightly produced, bluntly pointed as seen from the side, rounded as 

 seen from above. The abdominal somites are quite smooth. The telson (text-fig. 4 /.) has on 

 the dorsal surface a flattened area defined by a f^-shaped ridge. The pre-anal portion is sub- 

 cylindrical and relatively longer than in the female. Close to the pair of small apical spines on 

 each side is a smaller lateral spine and a little way from this a minute seta. 



The antennules have the distal segment of the peduncle enlarged and carrying a brush 

 of fine sensory filaments. The outer flagellum is long and slender, composed of four segments, 

 the basal one somewhat dilated. The inner flagellum is half the length of the outer, also 

 composed of four segments, the terminal one very minute. 



