. Bulletin - United States National Museum. Science. GAMMARIDEAN AMPHIPODA 61 gnathopod 2 much broader, more f alconif orm; pereopods 3-5 slightly longer and more slender and pereopod 3 lacking lateral ridge on article 2; pleonal epimeron 2 similar but ventral margin slightly more concave. Kelationships.—The similarities of the two populations in terms of general shapes and armaments are striking. For instance, the spines on the outer plate of maxilla 1 are similar, even though complex; the armaments and shapes of uropod 3 are similar. I have figured the. Figure 26.—Orchomene pinguis (Boeck),
. Bulletin - United States National Museum. Science. GAMMARIDEAN AMPHIPODA 61 gnathopod 2 much broader, more f alconif orm; pereopods 3-5 slightly longer and more slender and pereopod 3 lacking lateral ridge on article 2; pleonal epimeron 2 similar but ventral margin slightly more concave. Kelationships.—The similarities of the two populations in terms of general shapes and armaments are striking. For instance, the spines on the outer plate of maxilla 1 are similar, even though complex; the armaments and shapes of uropod 3 are similar. I have figured the. Figure 26.—Orchomene pinguis (Boeck), female, mm, Santa Monica Bay, Calif., 183 m: a, apex of right mandible; b, inner plate of maxilliped; c, outer plate of maxilla 1; d, maxilla 1; e, mandibular palp. Female, mm. Woods Hole, Mass., 1875:/-A, pereo- pods 3,4,5. Female, mm, Santa Monica Bay: i, maxilla 2; /, maxilliped, inner plate unflattened and setae removed; k, mandible, palpar setae removed. Female, mm, Santa Monica Bay: /, lower lip. parts from the Californian population and those of the Woods Hole population only where they differ. The posterior edges of the pleonal epimera are minutely but distinctly serrate in specimens from Woods Hole, but the serrations on Californian specimens are extremely weak, especially those on epimeron 3. In both populations the second article of the outer ramus of uropod 3 is longer and more attenuated than that shown by Sars (1895, pi. 24, fig. 2). Coxa 6 was inadequately represented by Sars but is correctly shown by Gurjanova (1962) for populations from the northwestern Pacific. 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 Su
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