2 2 2 



57 

 2.75 

 7.8 

 6.7 



verging towards the tips; the third segment is as long as, and only very little broader than 

 the second segment, and its lateral angles are right, not acute. 



The animal is of a smooth, shining appearance and of a uniform ivory-white colour, 



like N. nitidus. 



Alcock records a single specimen from the Andamans, depth 53 fathoms. 



Dimensions in mm.: ^ ^ 



Fronto-orbital distance ... 2.5 



Anterior margin of front . . 1.2 



Breadth of carapace .... 2.9 



Length of carapace . . . . ; 2.4 



The eo-o-s of the Q are not very numerous and rather larger (0.37 — 0.38 mm.). 



Paraselwynia n. g. 



The "Siboga'* collection contains a single crab, which is certainly related to the species 

 Sehvynia laevis Borradaile *) : the carapace is broadly oval, the lateral margins are entire and 

 strongly arched, the eyes distinct, well pigmented and their peduncles not fixed into the orbits. 

 Vet there are several points warranting even a generic. distinctness from Selwynia: the walking 

 legs are narrower, and very heavily fringed, the dactyli are lon-g and slender; 

 the merus oft he e.xternal maxillipeds is subquadrate, with the antero-external 

 angle distinct, rectangular, not greatly rounded off, and the carpus is in- 

 serted at the antero-internal angle, not nearly in the middle of the anterior 

 margin, as in Sehvynia-^ finally the front is not bilobed, nor grooved in the middle. 



I. Paraselwynia iirsina n. sp. PL 14, Fig. 2. 

 Stat. 258. Tual, Kei Islands. Depth 22 m. i 9- 



This species is broadly oval, its breadth being nearly 1.4 times its length, with the 

 lateral margins greatly arched, entire, and the fronto-orbital distance less than half the breadth 

 of the carapace (in Selwynia laevis, according to the figure, this fronto-orbital distance is 

 somewhat more than half the breadth of the carapace) ; it is very slightly tumid in transverse 

 direction, longitudinally it is strongly curved in its anterior third. The whole carapace is entirely 

 hairless, of a dull appearance, smooth, with a few groups of large pits, distributed symmetrically : 

 two of these groups are situated on the protogastric, two on the branchial regions, and one on 

 the cardiac area ; the cervical groove is represented, about in the centre of the carapace, by 

 some interrupted, transverse depressions. 



The front is bent downward and not at all sulcate, its anterior margin is perfectly 

 straight, not bilobed, and about as broad as the two orbits together, its lateral angles 

 are somewhat obtuse. The orbits are small, marginal, transverse, the ej'e-stalks shortened, 

 freely movable, provided at the end with a perfectly developed, normal 



l) Fauna and Geography Maldive and Laccadive Arch., v. 1, 1903, p. 430 — 431, textfig. 112. 



74 



