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Figure 20.— Nesippus costatus? Wilson, 1924: a, ventral view of genital segment, abdo- 

 men, and caudal ramus of younger early encysted specimen; b, same, of older early 

 encysted specimen; c, ventral view of posterior portion of genital segment, fifth legs, 

 abdomen, and caudal ramus of late encysted and recently excysted specimens; d, dorsal 

 view of anterior end of late encysted and recently excysted specimens showing eyes, 

 conspicilla, and frontal organ; e, antennule of younger early encysted specimen;/, anten- 

 nule of older early encysted specimen; g, antennule of late encysted specimen; h, distal 

 end of first segment of antennule of recently excysted specimen; i, second antenna of 



