1922. J 



S. Kemp : Notes on Crustacea Decapoda. 



159 



broad, about twice as long as wide; its outer margin is convex and 

 terminates in a spine which fails to reach the end of the lamella. 



The third maxillipeds are stout and reach nearly to the end 

 of the basal antennular segment. They possess a small arthro- 

 branch and the ultimate segment is about two thirds the length 

 of the penultimate. The first peraeopods are unusually heavy and 

 reach beyond the scale by rather more than the length of the 

 fingers. The merus is a little longer than the carpus and is about 

 5 times as long as broad. The carpus is 4 times as long as its 

 distal breadth and is a little shorter than the chela. The fingers 

 bear tufts of setae and are broadly spatulate, rather shorter than 

 the palm. 



The second legs are markedly unequal in the single specimen 

 examined. The left leg, which is the larger; reaches beyond the 



Text-fig. 25. — Periclimenes rex, sp. nov. 



a. Antenna] scale. c. Fingers of larger second peraeopods. 



b. Last two segments of antennule. d. Dactylus of third peraeopod. 



scale by the whole length of the carpus and chela, the smaller leg 

 by the chela only. The merits of the larger limb is rather less 

 than 4 times as long as wide and bears a blunt tooth at the distal 

 end on the lower side ; it is about 2*2 times the length of the carpus. 

 The carpus is conical, scarcely longer than its greatest breadth and 

 has a deep and narrow excavation on the upper side of its distal 

 margin. The chela is fully 1*5 times the length of the carapace 

 and is 2*25 times as long as the merus. The palm is rather less than 

 4 times as long as wide and is 2*5 times the length of the fingers. 

 The fingers (text-fig. 25c) have yellow inturned claws at their 

 tips and are beset with a multitude of fine hairs. 1 On the 

 inner edge of the dactylus at the base there is a large tooth which 

 bears against a grinding surface at the proximal end of the 

 dactylus, and in front of this, a little behind the middle point, 

 there is a sharp conical tooth with a rounded excavation on either 

 side. On the fixed finger there is a sharp tooth near the middle 



Not shown in text-fig. 25c. 



