16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



spine, spine on central lobe smaller than spines on lateral lobes; narrow 

 canal extending into spines on lateral lobes. 



Lower lip: Hirsute, rounded, consisting of 2 lobes, each smaller 

 than lateral lobe of upper lip. 



Copulatory organs: Female genital organs ill defined. Male copula- 

 tory limbs well developed, each having 2 elongate lobes with 1 to 2 

 bristles (fig. 7c). 



Dorsum (fig. 6d): Margin ventral to dorsal process with fine hairs; 

 dorsal process finger-like, hirsute. Male and female similar. 



Description of N-l male instar (figs. 7e-m). Shell (figs. 7e, f) in 

 lateral outline similar to adult female. 1st antenna (fig. 7g) similar 

 to that of adult female with following exceptions: 3rd joint with 6 

 dorsal bristles; sensory bristle on 5th joint with short filament proximal 

 to 6 terminal filaments. 2nd antenna: Exopodite similar to that of 

 female; endopodite 3-jointed with 3rd joint weakly separated from 

 2nd: 1st joint bare; 2nd joint with 2 short bristles; 3rd joint with 

 proximal bristle. Mandible (figs. 7i, k) 5th, 6th, and 7th limbs, 

 upper and lower lips, rod-shaped organ and medial eye (fig. 71) , f urea 

 and dorsal process similar to adult female. Lateral eyes (fig. 7m) 

 similar to those of adult male except with smaller ommatidia. Dimen- 

 sions of carapaces of N-l male instars are as follows: 



of 



remarks 



parasitized 



Several juvenile males differed from N-l males described above in 

 being larger and in having numerous filaments on the sensory bristle 

 on the 5th joint of the 1st antenna. These specimens appear to have 

 continued to molt after reaching the N-l stage described above 

 without acquiring all charac 

 specimens are as follows: 



USNM station 



114050 2906 



2906 

 114054 1 



It is suggested that the occurrence of unusually large specimens of 

 an ostracod species occasionally reported in the literature and gen- 

 erally attributed to post adult molting may be caused instead by delay 

 of sexual maturity. 



