ix, d, 4 Cowles: Palaemons of the Philippine Islands 357 



about equal width. Usually those teeth which are near the distal 

 end of the upper border are separated from one another more 

 than those posterior to them. The first tooth is nearly always 

 separated from the second tooth by a distance which is con- 

 siderably greater than the distances separating the teeth 

 immediately anterior to them. The dental formula for the 



specimens in the collection is — — .' ' ' , but the large 



4, o, b, l 



majority of the females show a dental formula of — '-= — . 



First pair of legs. — The first legs extend beyond the tip of the 

 antennal scale in all specimens; in the youngest, only the 

 propodus is seen beyond it, but in larger specimens more of 

 the first legs overreaches the scale, and finally in the largest 

 individuals as much as one-third of the carpus extends beyond it. 



Chelipeds. — The chelipeds in this species are approximately 

 equal. All the females have chelipeds which are shorter than 

 the body, and the same is true of practically all the males until 

 they reach a length of about 77 millimeters. Beyond this size 

 the chelipeds are usually longer than the body, and in certain 

 specimens, Nos. 15, 16, and 17, which I consider to be young 

 mature males, they are relatively long. In the largest female, 

 No. 38, the tip of the merus extends beyond the antennal scale, 

 while in the smallest female, No. 25, three-fourth of the carpus 

 overreaches the scale. One of the largest males, No. 20, shows 

 more than one-half of the merus beyond the scale, while in the 

 smallest male only four-fifths of the carpus extends beyond it. 



It will be seen, if reference is made to Table III, that the 

 fingers of all individuals are shorter than the palm, except in 

 Nos. 1 and 2, which are the smallest males in the series. In 

 the case of the males the palm seems to grow much faster than 

 the fingers, so that an individual 88 millimeters long (No. 14) 

 has a palm one and two-thirds times as long as the fingers. One 

 of the young mature males, No. 20, shows the palm to be one 

 and three-fourths times as long as the fingers. The largest males 

 in the series have chelipeds which are shorter than the body 

 length except in the case of No. 23. At first sight I considered 

 these specimens to be "males feminises," but upon examining 

 them more closely I find that they have well-developed spines 

 on the carapace and abdominal somites and I am of the opinion 

 that these individuals are old mature males whose chelipeds 

 are regenerating. The palm of the largest male, No. 24, is a 

 little more than one and one-half times the length of the fingers. 



