394 The Philippine Journal of Science 19 14 



The merus varies in the shape of its cross section at different 

 points, and measures 19 millimeters in length. It is much longer 

 than the greatly compressed ischium, which is only 7.5 milli- 

 meters along its longest border. 



There is a considerable growth of hair on the ventral edge of 

 the palm and ischium. A few hairs are found near the ends 

 of the carpus and merus, but for the most part the palm, carpus, 

 merus, and ischium are without hairs. Closely set sharp spines 

 are present on the inferior and lateral surfaces of the proximal 

 end of the mobile finger, but the remainder of the finger is 

 smooth. Similar closely set spines are present on the inferior 

 border of the palm. These grade into much smaller and more 

 widely separated teeth on the inner surface and, on the outer 

 surface, into widely separated, very minute spines. A few rather 

 heavy spines are located along the outer surface of the anterior 

 border of the palm, where the mobile finger articulates. The 

 spines on the carpus are widely separated, and on the inner 

 surface they are fairly well developed. There are practically 

 no spines on the upper and outer surfaces of the merus and 

 ischium, but on the lower and inner surfaces they are very close 

 set and well developed. 



"Linear spaces" cannot be seen, but a longitudinal depression 

 on the outer and inner surfaces of the palm along a line connect- 

 ing the articulation of the mobile finger with the proximal end 

 of the palm is very conspicuous. 



The smaller cheliped (left) has slender, widely gaping fingers ; 

 the mobile one measures 12 millimeters in length, and the im- 

 mobile one is slightly shorter. Along the cutting edge of both 

 fingers is a dense growth of stiff hairs and a well-developed keel. 

 Near the proximal end of the immobile finger is a short portion 

 of the cutting edge, which shows indication of breaking up into 

 3 or 4 teeth. This is followed distally by a short space at the 

 end of which is a small tooth, but beyond the latter no teeth nor 

 tubercles can be seen. Three small teeth are visible at the 

 proximal end of the mobile finger. The short oval palm measures 

 7.5 millimeters in length, 4.5 millimeters in width, and 3.1 milli- 

 meters in thickness. The carpus is not so wide (4 millimeters) 

 as the palm, but it is considerably longer (10 millimeters). The 

 merus (9.5 millimeters) is slightly shorter than the carpus, and 

 the ischium measures only 6 millimeters in length. 



Unlike the larger cheliped, the fingers, palm, and carpus are 

 free from spines, but the lower surface of the merus and ischium 

 are armed with a few spines similar to those on the large cheliped, 

 but smaller. Patches of small spines are present on the anterior 



