SHRIMPS FROM THE MARSHALL ISLANDS — CHACE H 



Processa inolarist new species 



Figure 5 



Rongelap Atoll: Biirok Island; inlertidal coral; July 18, 1946; 

 M. W. Johnson; 1 ovigerous female holotj^pe (USNM 94763). 



Bikini Atoll : Namu Island ; reef at shore inside lagoon ; April 3, 1946 ; 

 M. W. Johnson; 3 female paratypes (2 ovigerous). 



Carapace with the antennal angle acute but not spinous; lower 

 anterior margin of carapace rounded and armed with a marginal row 

 of about five plumose setae. Rostrum (fig. 5,a,b) not reaching as far 

 as the ends of the eyes; it is simple, rather sharply upturned at the 

 tip, and armed with a few movable dorsal spines in the distal fourth 

 and with a stout seta inserted on each lateral surface just back of the 

 tip. Abdomen mostly smooth and bare except for a few slender spi- 

 nules or stout setae on the fifth and sLxth somites, as well as on the 

 telson and inner uropods; sixth somite about one-third again as long 

 as fifth; pleuron of fifth somite rounded, that of sixth somite armed 

 with a posterior tooth (fig. 5,c). Telson fully 1% times as long as 

 sixth somite, armed with two pairs of dorsal and three pau's of distal 

 spines (fig. 5,d,e). 



Eyes not large, the cornea little if any wider than the stalk (fig. 5, a). 

 Antennular peduncle with the penultimate distinctly shorter than the 

 distal segment (fig. 5,/); outer flagellum composed of 13 segments, the 

 first 10 of which are swollen. Antennal scale (fig. 5,g) slightly more 

 than three times as long as broad ; the outer distal spine falls short of 

 the end of the blade. Antennal peduncle reaching about as far as the 

 distal end of the second antennular segment; antennal flagella some- 

 what longer than the body. Third maxillipeds (fig. 5,m) extend 

 beyond antennal scale by slightly more than the length of the distal 

 segment. Right leg of first pair (fig. 5,n) chelate and reaching about 

 to end of antennal scale. Left leg of first pair (fig. 5,o) simple and also 

 reaching about as far as end of scale. Right leg of second pair (fig. 

 o,p) reaches beyond antennal scale by the chela and about one-third 

 of the carpus; carpus divided into six articulations, the proximal two 

 of which are obscure; merus undivided. Left leg of second paii- 

 (fig. 5,q) slightly longer than the right, but otherwise similar to it. 

 Third leg (fig. 5,r) overreaches antennal scale by sightly more than 

 the dactyl and propodus; fourth leg (fig. 5,s) by the dactyl, propodus, 

 and about one-thu'd of the carpus; and the fifth leg (fig. 5,0 by little 

 more than the dactyl. 



The mouthparts are shown in figure 5,h-l. The most unusual 

 feature of these appendages is the relatively enormous size of the 



