ix, d, 4 Cotvles: Palaemons of the Philippine Islands 335 



palm grows faster than the carpus as the individuals increase 

 in size, a fact which has been pointed out by several authors. 

 The carpus of the largest male in the collection measures 122 

 millimeters in length, and is cylindrical in cross section through- 

 out practically the whole extent. Near its distal end the diameter 

 is 17 millimeters, while at a point near the proximal end it 

 measures 13 millimeters. Eleven indistinct longitudinal rows of 

 small spines are present on the outer surface, and these are 

 separated from 3 indistinct rows of medium-sized spines on 

 the inner surface by a dorsal and a ventral longitudinal row of 

 blunt and conspicuous spines. One of the largest of these 

 spines is 4 millimeters in length. The 2 linear spaces men- 

 tioned above are very distinct, and lie "on the dorsolateral and 

 ventrolateral regions of the outer surface. All younger males 

 and females show the carpus to be of the same shape as that 

 of the large male. In the youngest individuals (100 to 115 milli- 

 meters) minute spinules may be seen with a lens, and slightly 

 older specimens show the beginnings of the 2 rows of largest 

 spines. The "linear spaces" can hardly be made out until the 

 spines show clearly to the naked eye. 



The merus, which retains about the same relative proportion 

 in length to the carpus throughout life, is cylindrical anteriorly 

 in the largest male, and has a length of 100 millimeters. It 

 increases gradually in size, passing from the proximal end for- 

 ward, and near the distal end suddenly decreases in diameter 

 thus giving the impression of a swelling. About 13 milli- 

 meters from its proximal end it measures 13 millimeters, and 

 at the thickest part of the distal end it measures 18 millimeters 

 in diameter. The merus at its articulation with the ischium is 

 much flattened dorsoventrally, so as to correspond to the distal 

 end of the ischium. The dorsal and ventral longitudinal rows of 

 large spines, which are very conspicuous on the carpus, are even 

 more so on the merus, one of the largest spines measuring 5 

 millimeters in height. There are 6 indistinct longitudinal rows 

 of small spines on the outer surface and 5 indistinct rows of 

 medium-sized spines on the inner surface. The more dorsal 

 "linear space" of the carpus is continued on the merus, while 

 the more ventral one is absent or at least not clearly marked. 

 The description of the character of the surface of the carpus in 

 younger males and females applies to that of the merus in speci- 

 mens of the same age. 



The ischium (57 millimeters in length) in the largest male 

 is greatly flattened dorsoventrally, and increases in size toward the 

 distal end. On the dorsal and ventral surfaces there are 2 lon- 



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