. Bulletin - United States National Museum. Science. 358 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. extend three-fourths the length of the segment; those of the two segments extend the entire length of the segment. The abdomen consists of three distinct segments, with suture lines on either side of another partly coalesced segment. The third or terminal segment has subparallel sides to about the middle, where the segment gradually becomes narrower to a truncate extremit3\ On the posterior margin of the terminal segment is a faint indication of a double emargination on either side of an
. Bulletin - United States National Museum. Science. 358 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. extend three-fourths the length of the segment; those of the two segments extend the entire length of the segment. The abdomen consists of three distinct segments, with suture lines on either side of another partly coalesced segment. The third or terminal segment has subparallel sides to about the middle, where the segment gradually becomes narrower to a truncate extremit3\ On the posterior margin of the terminal segment is a faint indication of a double emargination on either side of an obtuse median point. Legs small and slender and devoid of hairs. The fiv^e small specimens and one large one agree in having the terminal segment as described above. The two larger specimens show the doul)le emargination more distinctly, one of the specimens more so than the other. Figures showing all three variations are given. The specimens agree in all other characters. Dana's specimens were collected b}^ Prof. J. Le Conte on the coast of California. IDOTHEA UROTOMA Stimpson. Idotea urotoma Stimpson, Proc. Acad. Nat. Sci. Phila., XVI, 1864, p. 155.—Miers, Jour. Linn. Soc. London, XVI, 1883, j). 34.—Richardson, Proc. U. S. Nat. Mus., XXI, 1899, p. 845; Ann. Mag. Nat. Hist. (7), IV, 1899, p. 264; American Naturalist, XXXIV, 1900, p. 226. Locality.—Puget Sound. Body linear, elongate, nearly four and a half times longer than broad, 4 imn. : 17^ mm. Head as wide as first segment of thorax smd 2^ mm. long. E3'es small, round, and situated close to the lateral margins. The first pair of anteiuKV have the basal article large, dilated; the second and third are small and narrow, subequal; the fourth is clavate. The first pair of antennic extend to the end of the second article of the pedunck^ of the second pair of antennte. The joints of the peduncle of the second antenna? are short and thick; the first article is inconspicuous in a dorsal view; the second and third articles arc
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