ix, d, 4 Cowles: Palaemons of the Philippine Islands 347 



just described are as follows: Propodus, 105.5; fingers, 38.5; 

 palm, 70 ; carpus, 84 ; merus, 45.5 ; ischium, 28.5. 



The telson of this specimen ends in a subacute spine. The 

 externolateral spines are slightly less than 1 millimeter in length, 

 while the internolateral spines, which extend with a little less 

 than one-half their length beyond the tip of the telson, measure 

 about 1.5 millimeters in length. (See description of telson in 

 smaller specimens.) 



Patches of very obtuse spines are present on the anterior sur- 

 face of the carapace. Similar spines are seen on the ventral 

 and lateral parts of the pleura, on the dorsal surface of the 

 sixth somite and the telson, and on exposed parts of the dorsal 

 and ventral surfaces of the uropods. These spines are especially 

 numerous on the last three structures named. 



The ischium of the first pair of legs and the 5 distal segments 

 of the third, fourth, and fifth pairs of legs are clothed with acute 

 spinules. Eight or 9 indistinct longitudinal rows of blunt, small 

 spines (much smaller than the tubercles) are seen on the mobile 

 finger of the chelipeds, and the immobile finger bears 7 or 8 

 rows of similar spines. The palm is armed with 26 or 27 more 

 distinct longitudinal rows, made up of larger and more acute 

 spines than those of the palm, the spines of the ventral and 

 dorsal surface being the largest. On the carpus are 17 or 18 

 longitudinal rows of spines, similar to those of the palm. A 

 dorsal "linear space" is evident, and a ventral "linear space" is 

 very conspicuous. It will be seen that these spaces are not 

 situated on the lateral surface as in the local P. carcinus. The 

 merus presents about the same number of longitudinal rows made 

 up of spines similar to those of the carpus, and the dorsal and 

 ventral "linear spaces" can still be seen, although the former is 

 not very clear. There are 14 or 15 rows of acute spines on the 

 ischium, the largest ones being situated on the dorsal, ventral, 

 and internolateral surfaces. 



Rostrum and antennal scale. — The 8 female specimens in our 

 collection, when arranged according to increasing body length, 

 show a gradual reduction in the length of rostrum relative to 

 the length of the antennal scale. In a specimen 47 millimeters 

 long the rostrum extends slightly beyond the tip of the antennal 

 scale ; in others, 69, 71.5, and 86 millimeters long, they are equal ; 

 in specimens 93, 97, 99.5, and 118 millimeters long the rostrum 

 fails to reach the tip of the antennal scale by 2.5, 1, 3, and 3 

 millimeters, respectively. The rostrum extends 1 millimeter 

 beyond the tip of the antennal scale in the smallest male specimen 



