24 



PROCEEDINGS OF THE NATIONAL MUSEUM 



First antenna (fig. 11a): fourth joint with 1 ventral bristle; other- 

 wise similar to adult female. 



Second antenna: endopodite 1-jointed with short terminal spine 

 and 1-2 short annulate dorsal bristles (fig. 116); exopodite similar to 

 adult female; bristles on 2nd and 3rd joints and 9th joint with short 

 spines proximally along outer margin. 



Mandible, maxilla, 5th Hmb, furca: similar to adult female. 



Sixth Hmb: endite with 2 subequal bristles; end joint with 8 bristles, 

 otherwise similar to adult female. 



Figure 11. — Sarsiella zostericola Cushman, stage IV 9 from California: a, 1st antenna, 

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

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



Seventh limb (fig. lie) : elongate without bristles or terminal comb. 

 Eyes: medial eye large, pigmented; lateral eyes about same size as 

 medial eye. 



Frontal organ: 1-jointed with rounded tip. 



Genitalia : undeveloped. 



Description of female instar v (fig. 12; pi. 2). — Shell: oval in 



