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PROCEEDINGS OF THE NATIONAL MUSEUM 



and 2 postero ventral teeth on pereonite 5, whereas the 22 mm female 

 has only 2 posteroventral and 2 ventral supernumerary teeth on that 

 segment. Considerable phenotypic differences are seen, therefore, 



Figure 5. — Echiniphimedia echinata (Walker), female, 22 mm, ET 435: a, head, anterior 

 view (E = epistome, u = upper lip, m = mandible, hatching = antennal socket); b, seta of 

 maxilla 2; c, maxilla 2; d, right mandible; e, head and epistomal-labral complex; /, telson; 

 g, accessory flagellum; h, left mandible; i, seta of gnathopod 1;;', medial antenna 2; k, end 

 of gnathopod 1; /, apex of maxillipedal palp. Female, 19.5 mm, ET 436: m, coxae 3-5, 

 left to right. 



