. Bulletin - United States National Museum. Science. 3()6 BULLETIN 158, UNITED STATES NATIONAL MUSEUM End segment of first exopod with 2 apical plumose setae and 1 slender outer spine; each fifth leg tipped with 3 short spines natahs (p. 306) 2. Rostrum rounded at its tip, with a pair of subterminal setae; inner spine of end segment of first endopod curved and acuminate ignaea (p. 307) Rostrum squarely truncated, with a pair of terminal juxtaposed spines; inner spine of first endopod straight and blunt jousseaumei (p. 308) METIS NATANS (Williams) FlQtIBE 183 Ilyopsyllus natans Williams, 37th A
. Bulletin - United States National Museum. Science. 3()6 BULLETIN 158, UNITED STATES NATIONAL MUSEUM End segment of first exopod with 2 apical plumose setae and 1 slender outer spine; each fifth leg tipped with 3 short spines natahs (p. 306) 2. Rostrum rounded at its tip, with a pair of subterminal setae; inner spine of end segment of first endopod curved and acuminate ignaea (p. 307) Rostrum squarely truncated, with a pair of terminal juxtaposed spines; inner spine of first endopod straight and blunt jousseaumei (p. 308) METIS NATANS (Williams) FlQtIBE 183 Ilyopsyllus natans Williams, 37th Ann. Rep. Comm. Inland Fisheries Rhode Island, p. 73, pi. 1, 13 figs., 1907. Occurrence.—Obtained by Rathbun in a surface tow from the end of a wharf at Newport, R. I., July 29, 1880. Distribution.—Wickford and Charlestown Pond (Williams). Color.—Body orange-red, becoming very deep and even brownish in some parts, in others changing to a straw yellow and becoming more transparent. All the segments except the ce- phalic appear banded, being deeper in color through the middle and becoming lighter anteriorly and posteriorly. Tlie four posterior segments are nearly ^ uniform in color; the internal organs show dark brown beneath the orange-red; the appendages are yellow. There are two irregular longitudinal series of blood-red dots running through the metasome on either side of the midline. The eye is very dark blood red, with three clear lenses, one on each side and one in front at the base of the rostrum. (Rathbun.) Female.—Cephalic segment not so convex dorsally b as in the two following species, but still strongly Figure 183.— arched: rostrum large, thistle-shaped, and squarely Metis natans: a, ' *= ' . • t i. i Female, fifth truncated at the apex, where it carries two ciliated leg; b, male, ^^^ movable spiucs, curved downward; caudal rami fifth leg . -11 short and broad, the inner terminal seta as long as the body, its proximal half broadened and naked, its distal ha
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