. Bulletin - United States National Museum. Science. MARINE GAMMARIDEAN AMPHIPODA 199 Description.—Rostrum inconspicuous; accessory flageJlum absent; body smooth or witli slight dorsal teeth; coxa 1 small, hidden by follow- ing coxae; coxa 4 large, either shield-like or excavate posteriorly; upper lip incised; mandible with weak, sparsely spinose molar, not triturative, palp long, 3-articulate; lower lip with coalesced inner lobes, outer lobes with blunt extremities; palp of maxilla 1 uniartic- ulate; maxilla 2 small, lobes blunt; maxillipeds slender, outer lobes vestigial; gnathopods small, f
. Bulletin - United States National Museum. Science. MARINE GAMMARIDEAN AMPHIPODA 199 Description.—Rostrum inconspicuous; accessory flageJlum absent; body smooth or witli slight dorsal teeth; coxa 1 small, hidden by follow- ing coxae; coxa 4 large, either shield-like or excavate posteriorly; upper lip incised; mandible with weak, sparsely spinose molar, not triturative, palp long, 3-articulate; lower lip with coalesced inner lobes, outer lobes with blunt extremities; palp of maxilla 1 uniartic- ulate; maxilla 2 small, lobes blunt; maxillipeds slender, outer lobes vestigial; gnathopods small, first simple, second subchelate; uropod 3 uniramous, the single ramus 2-articulate; telson of medium length, entire, fused with pleonite 6; article 2 of pereopod 3 Figure 82.—Cressidae: a, Cressina monocuspis Stephensen (1931); b, uropod 3 of Cressa minuta Boeck (Sars, 1895, pi. 99); c, pleonite 3 and urosome, left to right, of Cressina, showing absence of urosomite 3. Relationship.—The Stenothoidae have all segments of the urosome and the telson distinct, coxa 4 is always shield-like, not excavate posteriorly (like Cressina, however) and article 2 of pereopod 3 is always linear. All Thaumatelsonidae have coxa 4 shield-like, not excavate pos- teriorly. Although the segments of the urosome may be coalesced the telson is not clearly fused with them and is usually thickened dorso- ventrally; article 2 of pereopod 3 is always linear. The Phliantidae have depressed, rugose bodies, and relatively equal 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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