44 U.S. NATIONAL MUSEUM BULLETIN 236 



lamella. External and apical spines of the endopodite, of the first 

 type; those along the internal border, of the second type. 



Setal and spinal formula (former in arabic, latter in roman numerals) : 



There is a small mistake in Sewell's table of setation in E. robusta 

 (1949, p. 33): the number of spines on the 3rd endopodal segment of 

 leg 3 is VI and not XI as Sewell's table indicates. Moreover, there 

 are 2 spines at the internal margin of the 2nd endopodal segment of 

 leg 4 and not 2 setae as Sewell's table seems to suggest. 



Strong spine at the internal corner of the basis of leg 1. Spines 

 on 3rd endopodal segment of legs 1-3 remarkably short, especially 

 those of internal margin. On corresponding endopodal segment of 

 leg 4, spines slightly longer; median apical spine of this segment 

 shorter than the segment (proportion 3:4). 



Leg 5 as in E. robusta, apical segment 3 times as long as the greatest 

 diameter, with 3 spines and 1 seta. The lengths of the spines can 

 best be judged from figure lOe. 



Color faded, whitish. No pigmented spot or eye visible. 



Adult male, total length 0.47 mm. (0.46-0.53 mm.). Greatest 

 diameter 0.17 mm.; length longest furcal seta 0.65 mm. 



General shape of body as in female (figs. 8c,d). The various parts 

 of the cephalo thorax have the following proportional lengths: 



somite head+1 2 3 4 



67 13 13 7=100. 



Cephalo thorax slenderer than in female; anterior part of head 

 developed very differently, as appears from comparison of figures 8a 

 and 8c?. Rostrum, as in female, invisible from above; it is a triangular, 

 sHghtly curved plate with rounded apex. 



Abdomen 6-segmented, 5th thoracic somite developed as in the 

 female, 1st and 2nd abdominal somites separate. No lateral swellings 

 on genital somite; genital plates caudally produced mto spine. In 

 addition there are two haired setae on each plate (fig. lOg). Setae 

 2 and 3 of furcal rami slightly stronger and notably longer than in 

 female, especially 2nd, which surpasses total length of body. 



Antennules with reduced number of segments (15), both chelate, 

 directed forward, last 2 segments on each side forming movable part. 

 The hinge, consequently, is developed between segments 13 and 14. 

 Setation and development of aesthetascs represented in figure 9h; 

 aesthetascs on ultimate segment are notably strong, especially distal 

 aethetasc, which is club-shaped. 



