372 The Philippine Journal of Science i»u 



meters in length, has a rostrum which reaches the tip of the 



peduncle of the first antenna. The dorsal border of the rostrum 



begins at the middle of the carapace, but in this region and for 



some distance forward it is without teeth. The ventral border 



curves upward moderately, the tip extends directly forward, 



and the ridge along the side of the rostrum divides the blade 



into a wide upper and narrow lower area. The rostral formula 



9 

 is „, and the proximal and distal teeth of the dorsal border 



are more widely separated than those between them. On the 

 ventral border the 2 teeth are situated well back from the tip. 



The slender first pair of legs extends with the whole of the 

 propodus beyond the antennal scale. 



The chelipeds which are decidedly unequal in length extend 

 with from one-third to one-half of the merus beyond the scale, 

 and are both considerably longer than the body. Of the two 

 chelipeds, the left is the longer, measuring 87 millimeters from 

 the tip to the proximal end of the ischium; the right measures 

 75 millimeters, and is slenderer. The description which fol- 

 lows applies to the left cheliped : The immobile finger curves in 

 less sharply and extends farther forward than the mobile finger. 

 It is considerably more than half as long as the palm (1 : 1.68), 

 and is distinctly swollen along its distal half. The keel of the 

 cutting edge is reduced to a raised line, but a short distance in 

 front of the proximal end of the finger there is a well-developed 

 triangular tooth measuring 1.5 millimeters in height, which 

 meets the cutting edge of the mobile finger and aids in preventing 

 the fingers from closing. Posterior to the tooth just mentioned 

 is a row of 3 much smaller confluent teeth (4 in specimen 14). 

 All of these teeth are obscured by a thick growth of hair, which 

 is limited to a narrow region on both sides of the cutting edge 

 as far forward as the middle of the finger. Along the inner 

 side of the cutting edge of the distal portion of this finger is 

 a row of 5 broad, low, and inconspicuous tubercles, which bear 

 a few stiff hairs. The sharply curved mobile finger is covered, 

 except at the tip, with a dense coat of hair and is not swollen. 

 The keel of the cutting edge is reduced as in the case of the 

 immobile finger. Along the cutting edge are 2 teeth, measuring 1 

 millimeter in height, which curve slightly posteriorly. The palm 

 is cylindrical in cross section and considerably shorter than the 

 carpus (1 : 1.26). The carpus, which reaches its greatest dia- 

 meter some distance back from the distal end, is much shorter 

 than the chela (1:1.28), while the merus, which is only slightly 



