. Bulletin - United States National Museum. Science. MARINfiE GAMMARIDEAN AMPHIPODA 435 Sebidae Figure 159 Diagnosis.—Accessory flagellum 2-articulate, elongate; molar of mandible obsolescent; plates of maxillipeds of medium size; gnatho- pods 1 and 2 chelate, gnathopod 1 larger than 2, article 3 of gnatho- pod 2 elongate; antenna 1 peduncle elongate; uropod 3 uniramous; telson entire; urosomites 2-3 coalesced. Monogeneric. See Lysi- anassidae, Leucothoidae, Anamixidae, Pagetinidae. Description.—Accessory flagellum 2-articulate, elongate; body smooth or with poorly developed carinae, urosomite
. Bulletin - United States National Museum. Science. MARINfiE GAMMARIDEAN AMPHIPODA 435 Sebidae Figure 159 Diagnosis.—Accessory flagellum 2-articulate, elongate; molar of mandible obsolescent; plates of maxillipeds of medium size; gnatho- pods 1 and 2 chelate, gnathopod 1 larger than 2, article 3 of gnatho- pod 2 elongate; antenna 1 peduncle elongate; uropod 3 uniramous; telson entire; urosomites 2-3 coalesced. Monogeneric. See Lysi- anassidae, Leucothoidae, Anamixidae, Pagetinidae. Description.—Accessory flagellum 2-articulate, elongate; body smooth or with poorly developed carinae, urosomites 2-3 coalesced; mandibular palp article 3 short, molar evanescent; remaining mouth- parts basic although plates of maxilUpeds somewhat small; coxae of medium length, rounded-quadrate below; gnathopods chelate, rather. Figure 159.—Sebidae: Seha armata Chevreux (1900): a, lateral view; b, upper lip; c, mandible; d, maxilla 1; e, maxil-liped;/,^, gnathopods 1,2; h, telson; i, antenna l;j, uropod 3. Seba saundersi Stebbing (1888): k, lower Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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