ix, d, 4 Cowles: Palaemons of the Philippine Islands 337 



females, 190 to 240 millimeters long, show a similar condition 

 to that found in the smaller individuals, except that the merus 

 and ischium of the first pair of legs are armed with spinules 

 and the spinules of the third, fourth, and fifth legs are. larger. 

 The surface of the carapace in large males (240 or 250 to 320 

 millimeters, with long chelipeds) is rough to the touch and beset 

 with spinules, except along the extreme posterior border. The 

 spinules of the dorsal and anterolateral regions are larger than 

 those of other parts. These spinules, which are usually acute, 

 point forward, and average about 0.5 millimeter in length. Most 

 of the dorsal and lateral surfaces of the abdominal segments 

 and the dorsal surface of the inner ramus of each uropod have 

 a growth of fine spinules, causing them to feel rough to the 

 touch. The first, third, fourth, and fifth legs are armed like 

 younger specimens, but the spines are larger. 



Eggs. — The eggs of the local form of Palaemon carcinus 

 measure from 0.5 by 0.5 to 0.5 by 0.66 millimeter. 



Color of living specimens. — The local form of Palaemon carci- 

 nus varies in color with the age, but the color is fairly constant 

 for any one age. The following color notes are taken from 

 living specimens. The carapace of females (115 to 190 milli- 

 meters) is greenish gray, but is marked with brown, gray, or 

 cream-colored streaks running longitudinally. The terga and 

 pleura of the abdomen have a general color similar to that of 

 the carapace, and are marked with rather irregular but more 

 or less parallel streaks of brown, gray, or cream, which make 

 a somewhat definite pattern. In the region of the hinge of each 

 of the abdominal somites is an orange-colored patch; these 

 patches are especially evident on the fourth, fifth, and sixth 

 somites. The ventral and lateral edges of the first 3 abdominal 

 somites show a cream-colored band, while the ventral edges of 

 the fourth and fifth somites have a similar but narrower band. 

 A cream-colored band is also present along the edges of the rami 

 and the outer edge of the basipodite of the swimmerets. The 

 chelipeds are blue or lavender in color, but where the segments 

 join there is an orange-colored patch. The first and second 

 antennae are blue, in part at least, and the internal flagellum 

 of the first antenna is a conspicuous blue. The rostrum is 

 strikingly marked by the vermilion color of its lateral longitu- 

 dinal ridge. The colors practically all disappear, sooner or later, 

 when the specimens are preserved, leaving the animals yellow 

 in color. Living males (100 to 190 millimeters) have a color 

 which is similar to that of the young females, except that the 

 cream-colored band is absent on the pleura of the abdomen. 



