374 The Philippine Journal of Science 1914 



along the side of the rostrum divides the blade into an upper 



and lower region, the former being the wider of the two in 



specimens of all ages. The dental formula is very constant 



,, /8, 9, 10\ 



m all specimens \ ' ' ). 



First pair of legs. — The first pair of legs in young males and 

 mature females extends with the tip of the propodus beyond 

 the antennal scale, but in the large males the whole propodus 

 is seen beyond the scale. 



Chelipeds. — The chelipeds of the smallest males and all the 

 females are approximately equal. An examination of Table V 

 shows that in the males the inequality between the chelipeds in- 

 creases with the increase in body length and that the difference 

 in length is most marked in those specimens which show mature 

 characteristics (Nos. 7, 8, 12). While it is difficult to determine 

 whether this unequal length is the result of injury and regenera- 

 tion or whether this condition is always characteristic of un- 

 injured middle-aged and old males, the fact that none of the 

 specimens in the collection shows chelipeds of such unequal length 

 that there can be no doubt that the smaller one is regenerating 

 indicates that the inequality is characteristic. The chelipeds 

 of the females (Nos. 15, 16, 17), the "males feminises" (Nos. 

 9, 11, 13), and the young immature males are shorter than the 

 body (Nos. 1, 2, 3, 4, 5, 6) . Young mature males and old mature 

 males have the chelipeds longer than the body (Nos. 7, 8, 10, 12) . 

 In the smallest males, one-half of the carpus extends beyond 

 the antennal scale, while in the largest males one-third of the 

 merus may be seen beyond. The females do not show a great 

 range in size, and a small fraction of the carpus only extends 

 beyond the antennal scale. 



The fingers of the youngest male, No. 1, are longer than the 

 palm, and those of the youngest female, No. 15, are equal in 

 length to those of the palm ; in slightly larger males and females 

 the palm becomes longer than the fingers, and in some of the 

 largest males the fingers are contained one and one-half times 

 in the palm. All of the male individuals except the smallest 

 one have felted hair on the mobile finger, a condition which is 

 not found in the females. There is also hair on the immobile 

 finger of the males, but this does not appear to be present until 

 the individual has reached a considerable size (No. 6). The 

 immobile finger of young mature males and old mature males 

 (Nos. 7, 8, 10, 12, 14) is swollen, and bears from 5 to 8 

 tubercles along the inner side of the cutting edge. The mobile 

 finger of the same specimens is conspicuosly curved, and bears 



