1905. ] FROM CHRISTMAS ISLAND. 545 
different localities of the Indian Archipelago, described, in 1892, 
in my paper on the Decapod Crustacea collected by Prof. Max 
Weber, are lying before me, as also are specimens from my own 
collection. When the young male from the River Palopo on 
the island of Celebes (de Man, in Max Weber, Zool. Ergebnisse, 
ii. 1892, p. 447) is compared with the male from Christmas 
Island, a doubt oceurs to me whether we are right in considering 
these two Prawns as belonging to oneand the same-species. The 
male from the River Palopo (P]. X VIII. figs. 16-19) is certainly a 
typical example of Pal. lar Fabr., but in the male from Christmas 
Island, the size of which is even a little smaller, all the legs have 
a much stouter shape, and there are no doubt still other differences. 
Specimens of Hupalemon, presenting the same characters as this 
male from Christmas Island, have formerly been referred by me, 
and no doubt also by other authors (because this form is probably 
also widely distributed throughout the Indian Archipelago), to the 
“well-known” Pal. lar Fabr.; but it appears to be a question 
whether this form may still be regarded as a variety or not. I do 
not venture to decide this question at present, because the speci- 
mens are apparently young, but I wish to draw the attention of 
carcinologists to it, confining myself at present to describing the 
specimens from Christmas Island accurately. 
These Prawns are, no doubt, young; the male is 62 mm. long 
from the tip of the rostrum to the end of the telson, the female 
43 mm. The carapace of both is smooth. The lanceolate rostrum 
(Pl. XVIII. fig. 7) of the male is rather short, shorter than the 
peduncles of the internal antenne, reaching but a little beyond the 
penultimate joint of these peduncles. The upper border, slightly 
arcuate above the eyes, is somewhat directed downward, though 
the acute tip extends horizontally forward; it carries eight equi- 
distant teeth, that reach to the tip. The first two teeth stand on 
the carapace, the third just before the frontal margin, above the 
insertion of the eye-peduncles, and these teeth diminish a little 
in length from the second, that is the longest, to the last one. 
The distal half of the lower border carries three equidistant teeth 
that are smaller than those of the upper border, and the first of 
which is situated just below the antepenultimate tooth of the 
upper border; the acute tip of the 8rd is a little farther from 
the extremity of the rostrum than from the tip of the 2nd 
tooth. At the level of the 1st tooth of the lower margin the 
rostrum is just as broad above as below the lateral carina, and the 
height of the rostrum at its base is a little larger than its breadth 
below that carina. Hepatic and antennal spines as in typical 
specimens of Pal. lar. Of the two pairs of spinules on the upper 
surface of the telson, the anterior is inserted on the middle, 
the posterior midway between the anterior pair and the tip of 
the telson. The telson ends posteriorly in a sharp tooth; the 
inner of the two spines on either side projects haif its length 
beyond the median tooth, whereas the outer spinule, barely half 
as long as the inner, reaches not so far backward as the median 
