GAMMARIDEAN AMPHIPODA 



49 



article 3 about 60 percent as long as article 2, setae short, marginal 

 and terminal on distal third of article; major spines of outer plate of 

 maxilla 1 of stout hippomedon-like form; outer plate of maxilliped 

 bearing discrete medial and apical spines ; gnathopod 1 perfectly sub- 

 chelate, palm transverse, defined by two spines, article 6 rectangular, 

 longer than 5, latter lacking posterior lobe, dactyl having distal nail 



Figure 20. — Avibasiopsis (?) fomes, new species, hdlotype, ?male, 2.6 mm, 7249: a-d, 

 percopods 2,3,4,5; e, coxa 3;/,g, gnathopod 1; /;,/, gnaLhopod 2. 



and accessory seta; coxa 1 generally tryphosa-like but somewhat 

 smaller and tapering more strongly (neither as slender nor as elon- 

 gated as in type-species of Amhashpsis) ; gnathopod 2 subchelate, 

 dactyl large and attached fully anteriorly, palmar corner bearing two 

 large spines; pereopods 1 and 2 simple, poorly setose, sixth articles 



