NO. 3571 RED SEA OSTRACODS — KORNICKER 17 



Fifth limb: Epipodial appendage with 45 phimose bristles. Outer 

 lobe of 3rd exopodite joint with 2 stout plumose bristles. 



Sixth Umb (fig. Qi) : First endite with 3 bristles, 2nd endite with 4 

 bristles, 3rd endite with 7 bristles; 2nd joint of exopodite with 14 or 

 15 bristles, joint not produced posteriorly; epipodial appendage repre- 

 sented by 2 short bare bristles. Surface of 2nd joint of exopodite with 

 clusters of short hairs (not shown on illustration). 



Seventh limb (figs. Qj~l) : Cleaning bristles : 4 in distal group, each 

 with 2 to 4 bells; 3 proximal bristles, each with 1 to 3 bells; some 

 bristles with short marginal spines. Terminal comb with about 7 

 marginal teeth, some with spmes. Two long ciu'ved pegs opposing 

 comb. 



Copulatory organ : Long slender, divided into 3 lobes with bristles. 



Fiu-ca (fig. 6m) : Each lamella with 11 claws: primary claws number 

 1, 2, 6, 10; secondary claws 3, 4, 5, 7, 8, 9, 11. Primary claws 1 and 2 

 and all secondary claws separated from lamella; all claws with double 

 row of spines. Primary claws decrease in length proximally on lamella. 

 Lamella near claws 1 and 2 with clusters of long hairs. 



Frontal organ: Elongate, 2-jointed with short spines on surface of 

 end joint and distal end of basal joint. 



Remarks. — Although I have identified the Red Sea specimen as 

 Euphilomedes arostratus, some differences between this form and that 

 described from the Maldive Islands (Kornicker, 1967) creates 

 doubt concerning their conspecificity. A difference of possible 

 significance is that the Red Sea form has 2 bristles in place of the 

 epipodial appendage on the 6th hmb as contrasted to 3 in this position 

 on the male of E. arostratus described from the Maldives. The female 

 of E. arostratus from the Maldives, however, has only 2 bristles, 

 suggesting that the species may have either 2 or 3 epipodial bristles. 

 Also, whereas the male of E. arostratus from the Maldives has 9 to 10 

 bristles on the inner lamella behind the rostrum, the Red Sea form 

 has 11, the same number as the female from the Maldives. This 

 suggests that the number of bristles in this position might vary from 

 9 to 1 1 for the species. The Red Sea specimen is also larger than the 

 Maldive form. In most characters, the Red Sea and Maldive Island 

 forms are so similar that it seems best at this time to include them in 

 the same species. 



