ix, d, i Cowles: Palaemons of the Philippine Islands 381 



females have chelipeds which are shorter than the body. In the 

 youngest individuals, as a rule, the propodus and part of the car- 

 pus extend beyond the antennal scale, with increasing size the tip 

 of the merus is seen beyond, and finally in the largest of our males 

 from one-third to one-half of the merus overreaches the scale. 



The fingers of all individuals of this species in our collection 

 are shorter than the palm, in the young they are only slightly 

 shorter, but in the largest specimens the length of the fingers 

 is contained one and one-half times or more in the length of the 

 palm. A few stiff hairs are present on the fingers, but there is 

 no dense felt such as is seen in some other species. Young 

 males, "males feminises," and all the females show no gaping of 

 the fingers, but in the old males the gape is very wide and the 

 immobile finger extends a little beyond the mobile finger. There 

 is no keel on the cutting edge of the fingers in the old males, 

 but in other individuals it is present. Four or 5 small proximal 

 teeth and 1 larger distal tooth are seen on the mobile finger of 

 young males, "males feminises," and all females, but in mature 

 males the smaller teeth become reduced to 2 or 3 long inconspicu- 

 ous tubercles and the large tooth becomes very much larger. On 

 the immobile finger 1 tooth is present in the youngest males and 

 females, but in older individuals (Nos. 7 to 13, inclusive) a 

 second smaller and proximal tooth appears. These 2 teeth are 

 well developed in the old males (figs, la and 76). 



The palm of the oldest males is almost cylindrical in cross 

 section, but in younger individuals it is flattened laterally. 



The carpus of young individuals is almost as long as the palm 

 and longer than the fingers, but with increasing body length 

 the palm becomes much longer than the carpus and even the 

 fingers show a greater length than the latter. The cylindrical 

 carpus is much wider at its distal than at its proximal end. 



The merus is always longer than the carpus or the fingers. 

 It is equal in length to the palm in young individuals, but much 

 shorter in old specimens. The proportion of the merus to the 

 carpus is very constant, varying from 1:0.75 to 1:0.93. The 

 merus is flattened dorsoventrally at its proximal end, and in 

 old individuals is much enlarged at its distal end. 



Third, fourth, and fifth legs. — The tip of the dactylus of the 

 third pair of legs extends slightly beyond the tip of the antennal 

 scale in young specimens (No. 2). The dactylus of the fourth 

 pair of legs fails to reach the tip of the scale by a short distance, 

 and the dactylus of the fifth pair of legs extends slightly beyond 

 the end of the carpus of the chelipeds. The propodus of the 



