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U.S. NATIONAL MUSEUM BULLETIN 271 



Relationship. — The loss of both mandibular palp and molar is 

 approached only in the Phliantidae, Eophliantidae, and Pro- 

 phliantidae but in those families the accessory flagellum is absent. 

 The characteristic coxae and globular shape of stegocephalids plus 

 the conical grouping of the mouthparts are unmistakable characters. 



Figure 161. — Stegocephalidae: Maxilla 2: a, Phippsia gihbosa (Sars, 1895, pi. 71); b, 

 Stegocephalina ingolfi Stephensen (192Sa); c, Stegocephalus inflatus Krjziyer (Sars, 1895, 

 pi. 69); d, Andaniexis ahyssi (Boeck) (Sars, 1895, pi. 71). Maxilliped: e, Phippsia; /, 

 Andaniotes simplex K. H. Barnard (1930); g, Andaniella pectinata Sars (1895, pi. 72); 

 h, Stegocephalus. Telson: i, Stegocephalus; j, Andaniopsis nordlandica (Boeck) (Sars, 

 1895, pi. 72). Pereopod 4: k, Andaniopsis; I, Stegocephalus. Pereopod 5 : m, Andaniopsis; 

 n, Stegocephalus; o, Tetradeion crassum (Chilton, 1924). Pereopod 5: p, Stegocephalus. 

 Uropod 3 : q, Stegocephalus; r, Andaniella. Pereopod 2 : s, Parandaniexis mirahilis Schel- 

 lenberg (1929b). Gnathopod 1: t, Stegocephalus. Gnathopod 2: u, Stegocephalus. 



