396 The Philippine Journal of Science 1914 



mature male and the largest one in the collection. Unfor- 

 tunately, the fingers on the large cheliped are broken. The palm 

 measures 35 millimeters in length, 15 millimeters in width, and 

 8 millimeters in thickness, indicating that with increasing age 

 the palm becomes wider in proportion to the length (1 : 2.33) 

 and thicker in proportion to the width (1:1.80). The patches 

 of spines on the carapace are better developed than in any of 

 the rest of our specimens, but as in the latter they are absent 

 from the abdomen. The superior portion of the outer surface 

 of the palm is absolutely smooth. 



The other specimen from Leyte (No. 1499) is of interest be- 

 cause it is a very young male, possibly a "male feminises." An- 

 teriorly, the rostrum dips only slightly, and there are no patches 

 of spines on the carapace or abdomen. The large chela is similar 

 in shape to that of specimen 128, but it is smaller. The palm 

 is well covered with fine spines, and the gape between the fingers 

 is small. There is no gape between the fingers of the small chela 

 and no thick growth of hair. Furthermore, the slender fingers 

 are only slightly longer than the narrow palm, which is no wider 

 than the carpus. 



The largest female, No. 593, measures 68 millimeters in body 

 length, the carapace and abdomen are smooth, and the chelipeds 

 are alike. There is no gape between the fingers which lack a 

 thick growth of hair and no teeth on the distal two-thirds, but 

 there is a well-developed keel on the cutting edge of the latter. 

 The fingers are shorter than the palm, which is compressed and 

 slightly wider than the carpus. 



Finally, specimen 1485, an old male from the water supply of 

 the city of Manila, is one which, owing to lack of material, I do 

 not feel justified in classifying at the present time. It measures 

 91 millimeters in body length, dense patches of spines are 

 present on the anterior part of the carapace, the abdomen is 

 smooth, and the rostrum is practically like that of Palaemon 

 latidactylus. The large cheliped in respect to the distribution 

 of spines and the toothing of the fingers is like that of Palaemon 

 latidactylus, but the shape of the chela is different. The fingers, 

 which are only slightly shorter than the palm, gape considerably. 

 The immobile finger is comparatively narrow at its proximal 

 end, and the mobile finger is not curved sharply. In the case 

 of the smaller cheliped, the palm has about the same width as 

 the distal end of the carpus, the fingers gape only moderately, 

 and the growth of hair on them is not so great as in specimen 

 1484. Further collections may justify the establishment of a new 

 variety of Palaemon latidactylus. If the view of Henderson and 



