. Bulletin - United States National Museum. Science. 414 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM TREBIUS TENUIFURCATUS Rathbun Figure 261 TreUus tenuifurcatus Rathbun, Proc. U. S. Nat. Mus., vol. 10, p. 559, pi. 29, 1887.—Wilson, Proc. U. S. Nat. Mus., vol. 31, p. 679, pi. 15, 1907; vol. 35^ p. 447, pi. 72, 1908. Occurrence.—Found on the outside surface of a sting ray captured in the fish nets at Menemsha Bight, Marthas Vineyard. Distribution. —Y^ood^ Hole (Rathbun): San Diego, Calif (Wilson). Color.—Body a uniform yellowish white with a very scattered tracery of minute spots and lines of
. Bulletin - United States National Museum. Science. 414 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM TREBIUS TENUIFURCATUS Rathbun Figure 261 TreUus tenuifurcatus Rathbun, Proc. U. S. Nat. Mus., vol. 10, p. 559, pi. 29, 1887.—Wilson, Proc. U. S. Nat. Mus., vol. 31, p. 679, pi. 15, 1907; vol. 35^ p. 447, pi. 72, 1908. Occurrence.—Found on the outside surface of a sting ray captured in the fish nets at Menemsha Bight, Marthas Vineyard. Distribution. —Y^ood^ Hole (Rathbun): San Diego, Calif (Wilson). Color.—Body a uniform yellowish white with a very scattered tracery of minute spots and lines of a bright reddish brown. These are widely scattered on the carapace and free segments but are closer to- gether on the genital segment and along the lateral margins of the abdo- men. Eye bright ruby-red. Female.—Carapace one-third wider than long, lateral lobes wide and blunt; eyes large and prominent; third segment much narrowed posteriorly; fourth segment the same length and width, rhomboidal; genital segment flask-shaped, narrowed anteriorly, with four large spines at each posterior corner on the dorsal surface and one pair of leg rudiments on the ventral surface. Abdomen five times as long as wide, 2-segmented, segments about equal; maxillae bipartite; furea with elongate rami; endopod of fourth legs 3-segmented. Total length, 4^.65 mm. Male.—Carapace as long as wide; third segment much shorter than the fourth but wider; fourth segment wider than genital seg- ment and two-thirds as long; genital segment longer than wide, with two pairs of leg rudiments. Abdomen 2-segmented, terminal seg- ment twice the length of the basal; branches of furca curved like parentheses. Total length, mm. Remarks.—Rathbun's original description of this species was from a single female, which had evidently shrunken in the preservative. Since then fresh specimens of both sexes have been obtained, and the description has been completed as above. The species can be recognized
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