. Bulletin - United States National Museum. Science. 384 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. small tubercles in longitudinal series in the median line at the base of this segment. The sides of the abdomen converge gradually to a narrow extremit}^, which has a deep median excavation. SYNIDOTEA MARMORATA (Packard). Idotea marmnrata Packard, Mem. Bost. Soc. Nat. Hist., I, 1867, p. 296, pi. viii, fig. 6.—Whiteaves, Canad. Nat., 1875, p. 262. Idotea himspida Streets and Kingsley, Bull. Essex Inst., IX, 1877, p. 108. Synidotea himspida Harger, Proc. U. S. Nat. Mus., II, 1879, p. 160; Report
. Bulletin - United States National Museum. Science. 384 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. small tubercles in longitudinal series in the median line at the base of this segment. The sides of the abdomen converge gradually to a narrow extremit}^, which has a deep median excavation. SYNIDOTEA MARMORATA (Packard). Idotea marmnrata Packard, Mem. Bost. Soc. Nat. Hist., I, 1867, p. 296, pi. viii, fig. 6.—Whiteaves, Canad. Nat., 1875, p. 262. Idotea himspida Streets and Kingsley, Bull. Essex Inst., IX, 1877, p. 108. Synidotea himspida Harger, Proc. U. S. Nat. Mus., II, 1879, p. 160; Report U. S. Comm. of Fish and Fisheries, Pt. 6, 1880, p. 352. Edotea bicnspida Miers, Jour. Linn. Soc. London, XVI, 1883, p. 66. Si/nidotca marinorata Benedict, Proc. Acad. Nat. Sci. Phila., 1897, p. 392.—Richard- son, Proc. U. S. Nat. Mus., XXIII, 1901, p. 542.—Ortmann, Proc. Acad. Nat. Sci. Phila., 1901, p. 156. Localities. —Labrador; Grand Bank; Battle Harbor, Labrador. Depth.—Yi to 129 fathoms. Body ovate, two and three-eighths times longer than ))road, 8 mm.: 19 nmi. Length of abdomen nearly equal to one- third the entire length of the body, 6 mm.: 19 mm. Head with a deep median excavation or notch. On either side of the median notch the front is produced anteriorly and has the lateral portion bend down- ward, forming an angle with the dorsal portion. The eyes are large and round, composite in structure, and placed about the middle of the head at the extreme lateral margins. The first pair of antennffi have the basal articles long, not expanded, and about equal in length to the second article; the third is a little longer than the second; the fourth is about as long as the second. The first antenna extend a little beyond the third article of the peduncle of the second pair of antenna*. The basal article of the second antennae is short, and almost inconspicuous from a dorsal view; the second article is also short; the third is twice as long- as the second; the fourth is
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