94 



U.S. NATIONAL MUSEUM BULLETIN 271 



Figure 43. — Argissidae: a, accessory flagellum [see Ampeliscidae]; b, coxae 1-4, left to right 

 [see Gammaridae, especially Megaluropus; Haustoriidae]; c, gnathopod 1 [2 is similar], 

 feeble; d, telson. 



Shallow-water Ampeliscidae have external cephalic cuticular lenses and amalgamated 



urosomites 2-3. Shallow-water Argissidae have four internal, bigeminous, lenticular, ocular 



bodies. 



