384 The Philippine Journal of Science 1914 



right fifth leg measures 0.5 millimeter in diameter at its middle 

 point, and is 7 millimeters long. In old specimens (No. 13) the 

 tip of the dactylus of the third leg extends slightly beyond the 

 antennal scale, the tip of the dactylus of the fourth leg fails 

 slightly to reach the tip of the scale, and one-fifth of the propodus 

 of the fifth leg extends beyond the tip of the peduncle of the 

 second antenna. The diameter of the propodus of the right fifth 

 leg at the middle point is 1.5 millimeters, and its length is 17 

 millimeters. 



Telson. — The tip of the telson (specimen 81 millimeters long 

 and not listed in the table) is subacute, the externolateral spines 

 fail by their own length to reach the level of the telson tip, and 

 the internolateral spines extend with three-fifths of their entire 

 length beyond the tip of the telson. 



Character of the surface. — All specimens of Palaemon lar in 

 our collection have smooth bodies. Even the largest males show 

 no signs of the patches of spines which are found on the carapace, 

 pleura of the abdominal somites, tergum of the sixth somite, 

 uropods, and telson of mature males in some other species. The 

 first legs are smooth in small specimens, but in medium-sized and 

 large individuals the ischium is armed with short, heavy, in- 

 conspicuous spines. The chelipeds are well supplied with 

 strongly developed subacute spines, which are arranged in 

 rather definite longitudinal lines. These spines are found on all 

 segments, and those on the inner side are the largest. Two 

 sets of "linear spaces" can be distinguished in all middle-sized 

 and large specimens. One set is found on the outer lateral sur- 

 face of the palm, carpus, and merus, the other is found along 

 the ventral surface of the same segments. The third, fourth, 

 and fifth legs of young individuals have well-developed spines 

 on the propodus, but the remaining segments are smooth. With 

 increasing size more of the segments become spiny, until in the 

 old males with mature chelipeds the dactylus, propodus, carpus, 

 merus, and ischium have a coating of spines. 



Eggs. — The average size of the preserved eggs of the single 

 female specimen is 0.5 by 0.6 millimeter. 



Color of the living specimen. — The carapace, abdomen, and 

 telson of the male vary in color, being grayish brown, olive, or 

 very dark blue. The uropods are usually olive or dark blue, 

 with reddish brown around the edges. Very distinct orange- 

 colored spots are seen on the sides of the abdomen at the junc- 

 tions of the terga and pleura, except in the case of the third 

 segment. There are no T- or L-shaped markings on the carapace. 

 The first pair of legs is blue, tinged in places with pink; the 



