13' 



The legs of the i" 1 pair, almost as long as the external maxillipeds, extend by half 

 their terminal joint or a little more beyond the antennal scale, terminal joint or propodus, in 

 the female from Stat. 12, almost half as long as the carpus. 



The female from Stat. 65^ (Fig. 28) is the only specimen in which both legs of the 2 nd pair 

 are still preserved. These legs are very u n e qu al , the left being the more slender and longer 

 one. The left leg is 49 mm. long, nearly as long as the distance (51 mm.) between the orbital 

 margin and the tip of the telson, the ischium reaches to the distal extremity of the antennal 

 peduncle, while this very thin and filiform leg projects by the chela, the carpus and almost 

 half the merus beyond the antennal scale; the carpus, 23,7 mm. long and multiarticulate, is 

 half as long as the whole length of this leg, the chela is very small, minute, 0,9 mm. long, 

 only Y 26 the length of the carpus, while the fingers are just as long as the palm. The right 

 leg, 22 mm. long, is nearly half as long as its fellow and reaches only by the chela beyond 

 the antennal scale, while the merus extends to the middle of the antennal peduncle; the 

 multiarticulate carpus is 8,5 mm. long and the chela (2,08 mm.), the palm of which is one and 

 a half as long as the fingers, measures one-fourth of the carpus. In the somewhat larger female 

 from Stat. 1 2 the shorter right leg reaches by the chela and one-fourth of the carpus beyond 

 the antennal scale. The legs of the 3 rd pair reach in the female from Stat. 65 a by the dactylus 

 and almost half the propodus beyond the antennal scale, the merus extending to the far end 

 of the antennal peduncle, the following legs gradually diminish a little in length, so that those 

 of the 5 th pair reach only by the dactylus beyond the scale. The propodus of these legs is 

 one-fourth longer than the carpus, while the dactyli measure about one-third of the propodi. 



The external maxillipeds and the legs, except those of the 5 th pair, are furnished with 

 well-developed, though rather small epipodites. 



Eggs numerous, small, 0,5 mm. long. 



The female from Stat. 12 is 58 mm. long from the orbital margin to tip of telson, 

 the abdomen about 3-times as long as the carapace. 



This species bears some resemblance to Pies. heterocarpus Costa, of which three adult 

 specimens from the Gulf of Naples are lying before me. The general form of body and legs 

 is much the same and the 3 rd abdominal tergum is also carinate in the middle, but this carina 

 is broader, not compressed, but rounded both transversely and longitudinally and does not 

 terminate posteriorly in a tooth, while it extends almost to the posterior margin; the rostrum 

 is denticulate dorsally along its whole length and the dactyli of the three posterior legs are longer. 



General distribution: North of New Guinea (Bate); Andaman Sea (Alcock). 



6. Plesionika assimilis de Man. PI. XI and XII, Fig. 29 — 29^. 



Plesionïka assimilis J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks 

 Museum van Natuurlijke Historie te Leiden, Dl. III, Afl. 4, 191 7, p. 280. 



Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 

 54 — 90 m. Bottom fine grey sand ; coarse sand with shells. 3 males, 8 females, 

 7 of which are egg-laden, and 1 young specimen. 



A new species, closely allied to Pies. rostricreseentis (Bate), Pies. binoculus (Bate) and 



