30 



PROCEEDINGS OF THE NATIONAL MUSEUM 



in the adult the frontal organ is 2-jointed but the presence or absence 

 of a suture dividing the organ into 2 joints is difficult to establish with 

 certainty because of folds and creases that develop in the appendage. 



Figure IS.—Sarsiella zosiericola Cushman, stage V c? from California: a, 1st antenna, 3rd 

 to end joints, bristles shown only on 3rd and 4th joints; b, 2nd antenna, endopodite, 1st 

 and 2nd joints of exopodite; c, copulatory organ; d, 7th limb. (Same scale in microns: 

 a, b, d; c.) 



Eyes: Lateral eyes were not observed in embryo but are present 

 along with a medial eye in instars III-V and in adults. The lateral 

 eye of the adult male may be smaller than on the female. 



