88 



States (S. I. Smith, 1. c), in the figure of the "Recueil", however, the chelae measure just 

 one-third of the carpus, while, according to Smith, their length should be only one-fourth 

 or little more. The ischium is armed with 3 or 4 movable spinules along the lower border, 

 the merus with one spinule just behind the middle, sometimes with a second between it and 

 the proximal articulation ; carpus unarmed, slightly and gradually thickened distally. 



The legs of the 2"'' pair [jroject by the chela, carpus and Y^ or y. of the merus beyond 

 the antennal scale. As results from comparing the measurements on the Table with those that 

 are mentioned by Smith, the 2°<' legs should in the species, collected by the "Siboga", like in 

 the Nemat. cursor of Alcock, be somewhat shorter in proportion to the entire length 

 than in Nemat. cursor A. M.-Edw. from the east coast of the United States: in the indian 

 species the 2°<* legs measure just three-fourths the length of the animal, while they should 

 be, according to Professor Smith, in Nemat. cursor nearly as long as the animal or but little 

 shorter. Another difference is shown by the chelae, which in Nemat. iindulatipes measure one- 

 seventh of the carpus, but, according to S. I. S.mith, in Nemat. cursor scarcely more than 

 a tenth. In the figure of Nemat. cursor in the "Recueil" of 1883 the 2"<i legs appear, 

 however, even a little shorter than in the "Siboga" species and the carpus appears but 5-times 

 as long as the chela! In the "Siboga" species the ischium is armed with a movable spinule 

 not far from the proximal extremity and with another near the far end, the merus with 3 or 

 4 movable spinules along the posterior border and another at the up])er .side of the thickened 

 distal extremity. 



The legs of the 3"^*^ and of the 4''' pair show nearly the same measurements as are 

 mentioned by S. I. Smith. The legs of the ■}>^^ pair, about as long as the animal, though not 

 shorter, project by half the merus beyond the antennal scale ; the carpus is one-third, rarely 

 one-fifth, longer than the merus and the dactylus, which is .slightly waved, is lY-. — I'/^-times 

 as long as the propodus. Ischium arnicd on the lower border with a small spine near the base 

 and with a larger one near the distal extremity; merus with 3 — 5 small spinules both on the 

 lower and the upper border and with a somewhat larger spine on the upper side of the 

 thickened distal extremity. 



The peraeopods of the .^'^ pair are as long as those of the 3''' and reach also by one- 

 half the merus beyond the antennal scale ; the spinulation of ischium and merus is the same, 

 but the dactylus is comparatively shorter, being only one- fifth longer than the propodus. 



While, according to Smith, in the female of Nemat. cursor A. M.-Edw. from off the 

 east coast of the United States the legs of the 5''' pair should be as long as those of the 3""^ 

 and the 4'^, namely just as long as the animal, they appear in the female specimens of Nemat. 

 undulatipes considerably longer, namely one-fourth longer than the distance between 

 tip of rostrum and tip of telson ; another difference is presented by the carpus, which in the 

 indian form is longer with regard to the merus, namely about one and a half as long as the 

 latter. Dactylus rudimentary, measuring hardly one-third of the propodus. Except the terminal 

 joints, the three posterior legs of the "Siboga" species resemble pretty well the figure in the 

 "Recueil". The legs of the 5''' pair project also by half the merus beyond the antennal scale 

 and the spinulation of ischium and merus is the same as in the 3''<* and 4"^ pair of legs. 



