ix, d, 4 Cowles: Palaemons of the Philippine Islands 391 



longer than the palm, and is much reduced in diameter at its 

 posterior end. The merus equals the carpus in length, while 

 the ischium measures 8.5 millimeters. 



A "linear space" is seen along the outer surface of the merus, 

 carpus, and palm. The spines on the posterior, outer region 

 of the palm are scalelike and oval in shape, and each spine is 

 rather closely applied to the palm. Toward the anterior end of 

 the palm the spines become more pointed, and on the fingers 

 they curve at the tip, their upper surfaces being decidedly con- 

 cave and their lower surfaces convex. On the superior border 

 of the palm (the border continuous with the immobile finger) 

 are 2 rows of stout conical spines, and these spines are longer 

 than any of the others. Similar shorter spines are distributed 

 sparsely over the inferior inner surface of the palm, and these, 

 toward the superior region, grade into spines like those of the 

 outer surface of the palm. Smaller spines of similar shape and 

 distribution to those of the palm are found on the carpus, merus, 

 and ischium. 



The smaller cheliped (right) has slender widely gaping fingers, 

 the mobile one of which measures 15.5 millimeters in length. 

 Along the cutting edge of each finger is a dense growth of stiff 

 hairs, but no teeth, tubercles, or keel can be seen. 



The short oval palm measures 7 millimeters in length, 6 milli- 

 meters in width, and 4 millimeters in thickness. The carpus is 

 not so wide (5 millimeters) as the palm, but is somewhat longer 

 (9 millimeters). The merus (11 millimeters) is considerably 

 longer than the carpus, and the ischium measures 6 millimeters. 



The spines are much smaller than those of the larger cheliped, 

 but they have a similar shape and distribution. "Linear spaces" 

 are present. Patches of spines, which are characteristic of 

 supposedly mature individuals in many species of palaemons and 

 which are found on the carapace and abdomen, are not present 

 in our two specimens. 



In each specimen the tip of the telson is truncated, but this 

 is probably the result of wear. The internolateral spines extend 

 beyond the tip of the telson, a condition which is undoubtedly 

 true of uninjured specimens. As usual, the externolateral spines 

 are short. The inner ramus of the uropods extends poste- 

 riorly slightly farther than the outer ramus. 



The third, fourth, and fifth legs are rather stout as com- 

 pared with most other species of palaemons. The fifth leg is the 

 shortest and the slenderest, although there is but little difference 

 between the three. One-half of the propodus of the third leg 



