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Show 5 4 8 DR. J. G. DE MAN ON CRUSTACEANS [Dec. 12, As regards the two spines on the carapace and the telson, the female agrees with the male. The short flagellum of the internal antennae, when put back, reaches to tlie 1 st tooth of the upper border of the rostrum. The legs of the 1st pair agree also with those of the male ; the chela extends beyond the antennal scales and is distinctly more than half as long as the carpus. The legs of the 2nd pair are subequal, the left (PI. XVIII. fig. 13) being very little larger than the right. They show a less stout shape than those of the male, as is proved by the measurements. For example, the width of the distal end of the carpus is but one-fourth of its length, and the palm is also less broad in proportion to its length. The dactyl us carries one small obtuse tooth at the end of the sharp cutting-edge (fig. 14), at one-third of the length of the finger from the articulation, and four smaller teeth, also obtuse, posterior to i t ; the fixed finger oarries one single tooth at the end of the cutting-edge. These legs are also covered with small, slender spinules ; those on the inner margin of the palm are more prominent than on the outer and more numerous than on the upper and lower surfaces. The ambulatory legs (fig. 15) are also slenderer than in the much larger male. When, however, the legs of the 2nd pair are compared with a female from Kadjang of the same size which belongs to the typical form (de Man, I. c. 1892, p. 449), then they appear in the female from Christmas Island distinctly stouter, especially the carpus. The male from the River Palopo (p. 545) is 75 mm. long. The rostrum (PI. XVIII. fig. 16) reaches to the extremity of the antennal scales. The upper border, which is slightly arcuate above the eyes, carries 7 teeth ; the 2nd tooth, situated above the frontal border, is a little longer than the four following, which are subequal ; the foremost tooth is longer than the preceding and almost twice as far distant from the penultimate tooth as from the slightly upturned tip. The two teeth of the lower margin are situated below the 5th and the 6th of the upper border. The chehe of the 1st pair are barely half as long as the carpus. There is but one leg of the 2nd pair (fig. 17); this leg has a much slenderer shape than those of the male from Christmas Island (confer the measurements). The carpus is, at the distal end, comparatively only half as thick as in that specimen. The ambulatory legs (fig. 19) are also much slenderer than in the male from Christmas Island. I do not wish to go further into this question, but, at first sight at least, it appears probable that under the name of Pal. lar Fabr. two different species are confounded. The following may, however, be added. Specimens lying before me from a river near Mbawa in the island of Flores (de Man, I. c. 1892, p. 449) belong certainly to the same form as the male from Christmas Island. A male 71 mm. long fully agrees with it, as regards the shape and the characters of the rostrum and of the ambulatory legs (the 2nd |