ig22.J 



S. Kemp : Notes on Crustacea Decapoda. 



263 



wide. The chela is carinate on its lower edge from the middle 

 of the palm to the tip of the fixed finger. The finger-tips cross one 

 another when the claw is closed ; at the base the fixed finger is 

 twice as broad as the dactylus. The dactylus (text-fig. 916) has a 

 very large triangular tooth in the proximal half of its inner margin. 

 There are two large teeth on the fixed finger. The foremost of 

 these is very large and obtuse, the hindmost smaller, more acute 

 and pointing forwards, the two being separated by a deep and nar- 

 row notch. When the claw is closed the dactylar tooth partially 

 overlies the posterior tooth of the fixed finger. In the smaller sec- 

 ond peraeopod the merus is a little broader, with more strongly 

 convex borders ; the palm is only 1*3 times the length of the 

 merus or fingers. As in the larger limb the fixed finger is twice as 

 broad as the dactylus, but the fingers are unarmed on the inner 



Text-fig. gi.—Pontonia okai, sp. nov. 

 a. I.arpe second peraeopod. /;. Fingers of same. 



c. Dactylus of third peraeopod. 



margin except for three very obscure teeth at the proximal end, 

 one on the dactylus and two on the fixed finger. 



The last three peraeopods are long and slender. The third 

 pair reaches beyond the scale by half the length of the propodus 

 the fifth by the length of the dactylus. The merus is from 6 to 65 

 times as long as wide; the propodus bears a few spinules on its 

 posterior border and is from 3*7 to 4^3 times as long as the 

 dactylus. The dactylus (text- fig.. 91c) is straight and slender, more 

 than 4 times as long as wide; it is apically biunguiculate and the 

 large terminal claw appears to be articulated. Behind the two 

 distal claws there is a series of 11 to J 3 spines which are short and 



