ix, d, 4 Coivles: Palaemons of the Philippine Islands 387 



The following description applies to the largest male (No. 6, 

 Table VII), which is 72 millimeters long. The rostrum almost 

 reaches the tip of the peduncle of the first antenna and has the 



formula — . It is convex over the eye, dipping sharply ante- 



riorly and then extending horizontally at the tip. The teeth 

 on the carapace are more widely separated than those imme- 

 diately anterior to them, and the first one is situated a little 

 more than two-thirds of the distance from the posterior edge 

 of the carapace to the border of the orbit. 



The first pair of legs extends with two-fifths of the carpus 

 beyond the antennal scale. 



The chelipeds are decidedly unequal in size and length but 

 similar in shape, a condition which is found in all the males 

 of P. jaroensis in our collection and one which may be charac- 

 teristic of all middle-aged and old males of this species. In 

 the case of the larger cheliped, which measures 96 millimeters 

 in length, one-third of the merus extends beyond the antennal 

 scale. The mobile finger curves sharply, while the immobile 

 finger is practically straight, and when their tips meet a con- 

 siderable space is seen between them. Along the proximal por- 

 tion of the cutting edge of the immobile finger are 6 blunt, fairly 

 well-developed teeth which are not situated upon a raised ridge. 

 The 4 nearest the palm are confluent. Following the 6 teeth 

 is a space, and distal to this is a series of 11 blunt teeth arranged 

 at rather regular intervals along the cutting edge and extending 

 almost to the tip of the finger. The most proximal one of these 

 is larger than the rest. A series of 9 similar teeth are present 

 along the inner side of the cutting edge, but the teeth are not 

 upon the latter. There is no large tooth corresponding to the 

 one on the cutting edge. The toothing on the mobile finger 

 consists of 3 rather large, blunt, irregular, proximal teeth and 

 2 distal series of smaller blunt teeth separated from the former 

 by a space. As in the case of the immobile finger, the outer 

 teeth are found on the cutting edge while the inner are not. 

 There are 10 of the former and 8 of the latter, and there is no 

 conspicuously large tooth at the beginning of either series. 44 



44 An examination of the fingers on the large cheliped of smaller spec- 

 imens shows that the dentition is similar, but that the number of teeth 

 in the two series beyond the space may be much smaller, especially along 

 the inner side of the finger, and that there is some variation in the number 

 of proximal teeth. In the females very small proximal teeth are present 

 and the keel of the cutting edge is well developed, but the proximal series 

 of blunt teeth, so characteristic of the males, is not present on the fingers 

 of either cheliped. 



