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U.S. NATIONAL MUSEUM BULLETIN 271 



Accessory flagelliim 2-articulate, elongate; article 6 of gnathopod 

 1 longer than or equal to article 5; coxa 1 as long as coxa 2, coxa 5 

 longer than coxa 6; article 2 oj pereopods 3-5 narrow, linear, palp 

 article 4 of maxilliped claw-like, longer than article 3 {combining char- 

 acter). Species: 5, Atlantic, E. Pacific, bathyal to abyssal. 



Tsaeopsis K. H. Barnard 



Isaeopsis K. H. Barnard, 1916. 



Type-species: /. tenax K. H. Barnard, 1916 (monotypy). 



Accessory flagellum 1 -articulate; article 6 of gnathopod 1 longer than 

 article 5; coxa 1 "small," coxa 5 longer than coxa 6; pereopods pre- 

 hensile. Species: 1, S. Africa, littoral. 



Figure 108. — Ischyroceridae: Gnathopod 1: a, Ischyrocerus anguipes Kr0yer (Sars, 1895, 

 pi. 209); b, Jassafalcata (Montagu) (Sars, 1895, pi. 212); c, Pseudischyrocerus denticauda 

 Schellenbcrg (1931). Pereopod 1: d, Isaeopsis tenax K. H. Barnard (1916). Gnathopod 

 2: e, Jassa, note sharp distal palmar tooth and poor development of proximal tooth as an 

 exception to couplet 9 of key;/, Ischyrocerus. Pereopods 3, 4, 5: g,h,i, Microjassa macro- 

 coxa Shoemaker (1942). Uropod 3:/, Ischyrocerus; k, Jassa. Telson: /, Ischyrocerus. 



