352 PROCEEDINGS OF THE NATIONAL IVIUSEinVI vol. i06 



short downward-curving spines; the follomng joints are Uke those of 

 P.fascigera, and are as shown in figure 3,h. 



Peraeopods 1 and 2 much alike but 2 is a little the shorter (figs. 3,i 

 and 4,d). Peraeopod 3: About as long as peraeopod 2, second joint 

 much expanded, being as wide as long; fourth joint not much ex- 

 panded and little produced downward behind; fifth and sixth joints 

 about equal in length; the front margin of all joints bearing groups of 

 spines (fig. o,j). Peraeopod 4: Considerably longer than 3, and a 

 little shorter than 5; second joint not as much expanded as either 

 that of 3 or 5, hind margin nearly straight, and with very shallow 

 hind lobe; fourth joint not much expanded and not produced down- 

 ward behind; fifth joint a little shorter than the sixth (figs. 3,k and 

 4,g). Peraeopod 5: Second joint much expanded, being as vnde as 

 long; fourth joint scarcely at all expanded; fifth joint a little shorter 

 than the sixth. Both front and hind margin of sixth joint of peraeo- 

 pods 4 and 5 with groups of spines (fig. 4:,g,j). The seventh joint of 

 all peraeopods is short and nearly straight except for the rather 

 sharply upward-curving nail (fig. i,e,f,j). This dactyl is very char- 

 acteristic of P. fascigem and P. hawaiensis. All peraeopods are rather 

 short, as was noticed by ChevreiLx when he described Hyale brevipes 

 from the Sechelles Islands. 



Metasome segments 2 and 3 with lower hind corner about quadrate 

 or less than a right angle and not produced. Urosome segments 2 

 and 3 very narrow, not showing at all dorsally. Uropod 1 extending 

 back farther than 2, and 2 farther than 3. Uropod 1: Peduncle 

 longer than rami; upper outer margin bearing four to six spines besides 

 the stout terminal spine, inner margin with about four spines; rami 

 subequal in length, outer ramus with one to three marginal spines 

 and a terminal group; inner ramus with spine arrangement same as 

 that of outer ramus. Uropod 2 : Peduncle equal to or a little longer 

 than the rami, the outer of which is perhaps a little the shorter; 

 peduncle with a few marginal spines; outer ramus with one or two 

 marginal spines and a group of terminal spines; inner ramus with 

 two or three marginal spines and terminal group. Uropod 3 : Peduncle 

 about equal in length to the outer ramus and reaching to about the 

 end of the telson (figs. 4:,k,n), inner ramus very small and bearing 

 an apical spinule (fig. 4,n). Telson cleft to base with lobes widely 



gaping (fig. 3,w). , , ■, 



Coxal plate 1 is expanded below and produced forward as shown 

 in figure 4,a. Coxal plates 2 to 4 are broadly and evenly rounding 

 below. The gills of gnathopod 2 and those of peraeopods 1 to 4 are 

 sunple, as are those of P. fascigera. P. hawaiensis does not have 

 minute setules scattered over the body integument which are said by 



