26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Eggs (pi. 2d) : about 5 eggs in ovary of 1 specimen. Absence of 

 developed genitalia in instar V indicates that eggs, when present at 

 this stage, are not fertihzed. 



Description of male instar hi (fig. 13).— Shell: more elongate 

 and shghtly smaller than female instar III. Dimensions of a selected 

 specimen are as follows: 



locality midlength (.mm) midheight {mm) 



California 0.53 0.40 



First antenna (fig. 13a), 5th, 6th, 7th Hmbs (fig. 13c), furca, eyes, 

 frontal organ: similar to female instar III. 



Second antenna: endopodite 2-jointed (fig. 136); 1st joint with 1 

 dorsal bristle; 2nd joint with 1 small terminal bristle; exopodite 

 9-jointed, similar to matm'e female; bristles on 2nd to 4th joints and 

 9th joint with short marginal spines proximally. 



Mandible, maxilla: similar to adult female. 



Copulatory hmb : undeveloped. 



Figure 13. — Sarsiella wstericola Cushman, stage III cf from California: a, 1st antenna, 3rd 

 to end joints, bristles shown only on 3rd and 4th joints; b, 2nd antenna, protopodlte, endo- 

 podite, 1st and 2nd joints of exopodite; c, 7th limb. (Scale in microns.) 



Description of male instar iv (fig. 14). — Shell: shghtly more 

 elongate and smaller than female instar IV. Dimensions of a selected 

 specimen are as follows : 



locality midlength (mm) midheight (mm) 



California 0.59 0.50 



First antenna (fig. 14a), 6th limb, frontal organ, eyes: similar to 

 female instar IV. 



Second antenna: endopodite 2-jointed (fig. 146); 1st joint with 1-2 

 short annulate bristles; 2nd joint with 2 subequal bristles near middle 

 and 1 short stubby bristle terminally; exopodite similar to adult 



