. British fresh-water Copepoda. --. Copepoda; Crustacea. ERGASILUS SIEBOLDI. 313 not jointed, and an outer seta nearly twice as long as ramus. Two slender setae are situated on ventral side at apex, and are visible from above only with difficulty. Antennule of 6 short segments, with setae as follows (Markewitsch, 1932) : 1 2 3 4 5 6 Setae . .3. 11. 5. 4. 2. 7. Fig. 1927-1931.—Ergasilus sieboldi. Fig. 1927.—Adult female, lateral. After Markewitsch. Fig. 1928.—Abdomen, dorsal. Fig. 1929.—Furcal rami, ventral. Fig. 1930.—Antenna. Fig. 1931.—Mouth-parts. Mn., mandible; Mx. 1, maxillule; Mx. 2, max
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. British fresh-water Copepoda. --. Copepoda; Crustacea. ERGASILUS SIEBOLDI. 313 not jointed, and an outer seta nearly twice as long as ramus. Two slender setae are situated on ventral side at apex, and are visible from above only with difficulty. Antennule of 6 short segments, with setae as follows (Markewitsch, 1932) : 1 2 3 4 5 6 Setae . .3. 11. 5. 4. 2. 7. Fig. 1927-1931.—Ergasilus sieboldi. Fig. 1927.—Adult female, lateral. After Markewitsch. Fig. 1928.—Abdomen, dorsal. Fig. 1929.—Furcal rami, ventral. Fig. 1930.—Antenna. Fig. 1931.—Mouth-parts. Mn., mandible; Mx. 1, maxillule; Mx. 2, maxilla ; U.L., upper lip ; L.L., lower lip. Antennae of 4 segments, the relative lengths of segments as follows: 42.71.42.30. Mouth region in form of a compact cone, of which the side is formed by the large base of the maxilla, while the upper lip hangs over the mandible, and the lower lip closes the cone behind. Mandible with stout jointed terminal spine, with brush- like edge, and a small adjacent smooth spine ; an. 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 work.. Gurney, Robert. London : Ray Society