400 The Philippine Journal of Science 



wide (4 millimeters) as, and is considerably shorter (8.5 milli- 

 meters) than, the palm. The merus (9.5 millimeters) is slightly 

 longer than the carpus, and the ischium measures 6 millimeters 

 in length. 



The fingers are smooth, the palm is armed with a few minute 

 spines, and the carpus, merus, and ischium have fairly well- 

 developed spines on their inner and lower surfaces. Along the 

 inner surfaces of the carpus, merus, and ischium is a consider- 

 able growth of rather long hairs, and on the superior and inner 

 surfaces of the posterior end of the palm is a patch of felted 

 hairs similar to that on the large cheliped. The small cheliped 

 of the smaller specimen is essentially like that of the large 

 specimen, except that it is smaller, that the palm is relatively 

 shorter, and that the patch of felted hair is absent. 



The telson of the large specimen ends rather bluntly, a condi- 

 tion which is undoubtedly the result of wear; the externolateral 

 spines are very short, and the internolateral spines extend beyond 

 the telson tip for a considerable distance. The outer and inner 

 rami of the uropods are of equal length. 



Patches of small spines are present on the anterior part of 

 the carapace in the dorsal and lateral regions, but are not present 

 on the abdomen or its appendages. 



The third legs are slightly longer than the fourth, and the 

 latter are slightly longer than the fifth. They are all slenderer 

 than those of Palaemon lepidactylus and they are about the same 

 size as those of Palaemon latidactylus. One-fifth of the propo- 

 dus of the third leg and the tip of the dactylus of the fourth leg 

 extend beyond the antennal scale, but the fifth leg extends with 

 the dactylus only beyond the peduncle of the second antenna. 

 The propodus of the fifth leg measures 8 millimeters in length, 

 and at its middle point it is 1.0 millimeter in diameter. Both 

 specimens were collected by R. C. McGregor from the filter of 

 the Bureau of Science, which receives its water from the Manila 

 city water supply. 



