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BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



Antennular peduncle with the first joint about equal to the remain- 

 ing joints combined; second joint with two strong short spines on the 

 outer margin. 



Antennal peduncle (fig. 21, a) longer than its scale but shorter than 

 the antennular peduncle; terminal joint one-third the length of the 

 preceding joint. 



Figure 21. — Archaeomysis grebnitzkii Czerniavsky: a, Antennal scale and peduncle, X 45; 

 b, first pleopod of male, X 45; c, second pleopod of male, X 45; d, third pleopod of male, 

 X 45; e, fourth pleopod of male, X 45; /, fifth pleopod of male, X 45; g, telson, X 45; 

 h, uropods, X 45. 



Antennal scale (fig. 21, a) extending to the distal end of the penulti- 

 mate joint of its peduncle, three and a half times as long as broad, apex 

 of the scale somewhat squarely truncate, terminal spine very strong 



