. Bulletin - United States National Museum. Science. 198 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM TISBE WILSONI Seiwell Figures 131c, 132 TishG wilsoni Seiwell, Proc. U. S. Nat. Mus. vol. 73, art. 18, p. 3, pi. 2, 1928. Occurrence.—Both sexes were obtained from the common sea pork, A'ma7'ouciu?7i, collected near Woods Hole in the summer of 1925. Color.—Female creamy white and fairly transparent, ovaries and oviduct dark brown; male grayish white with a dark patch in the epimeral plate on either side of the first four thoracic segments. Feinale.—Body slender, metasome oval, twice as long as
. Bulletin - United States National Museum. Science. 198 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM TISBE WILSONI Seiwell Figures 131c, 132 TishG wilsoni Seiwell, Proc. U. S. Nat. Mus. vol. 73, art. 18, p. 3, pi. 2, 1928. Occurrence.—Both sexes were obtained from the common sea pork, A'ma7'ouciu?7i, collected near Woods Hole in the summer of 1925. Color.—Female creamy white and fairly transparent, ovaries and oviduct dark brown; male grayish white with a dark patch in the epimeral plate on either side of the first four thoracic segments. Feinale.—Body slender, metasome oval, twice as long as wide, urosome less than half the length of the metasome; genital segment divided at the center; caudal rami longer than anal segment, apical setae half the body length. First antennae 8-segmented and strongly tapered, especially distally; exopod of second antennae 4-segmented, attached to side of basal segment of en- dopod. Endopod of first legs twice as long as exopod, second segment longer than first, end segment spherical, its two apical claws without plumes. Basal seg- ment of fifth leg not much widened, its inner expansion with three setae; apical segment laminate, its width two-fifths of its length, with three end setae and two on the outer margin. Total length, mm. Male.—Body much more slender and elongated than that of the female; uro- some 5-segmented, the genital segment divided in front of its center, and slightly tapered backward, caudal rami as wide as long. First antennae geniculate, the terminal portion made up of two segments; second antennae, mouth parts, and first four pairs of legs as in the female. Fifth legs 2-segmented, basal segment without either inner expansion or outer process, terminal segment nearly as wide as long with two apical and one lateral setae. Total length, mm. Remarks.—This species is chiefly distinguished by the fact that it lives commensally in an ascidian. It conforms closely to the genus type except in the fifth leg
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