. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. B13 tubercles are situated in a transverse line on the ])osterior mart^-in of tliis seo-ment. The terminal se^-nient is subtriaiio-uhii- in shape, with a broad funnel like excavation at its extremity, formed by the infold- ing of the lateral edges. The anterior part of the terminal segnuMit is very convex, upon which elevation are situated three lai'o-e tul)er- cles in a transverse row, the center one ])eing- in the median line. At the base of the terminal excavation is also a small tubercle. Both branches of the ur
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. B13 tubercles are situated in a transverse line on the ])osterior mart^-in of tliis seo-ment. The terminal se^-nient is subtriaiio-uhii- in shape, with a broad funnel like excavation at its extremity, formed by the infold- ing of the lateral edges. The anterior part of the terminal segnuMit is very convex, upon which elevation are situated three lai'o-e tul)er- cles in a transverse row, the center one ])eing- in the median line. At the base of the terminal excavation is also a small tubercle. Both branches of the uropoda ar(> similarly shaped, being of the same width throughout their entire length, and rounded posteriorly. The outer branch is somewhat shorter than the inner branch; neither reach the extremity of the abdomen. Individuals were found at Gualala, California, on TIaliotis rufescens, by Dr. R. E. C. Stearns; also, one specimen at Catalina Harbor, Cali- fornia, and one at Popoti' Island, Aleutian Islands, at low water, b}^ Dr. VV. H. Dall. Type.—Qui. No. 22569, Popoff Island, Aleutian Islands. CILICiEA GILLIANA Richardson. Cilicxa Cauda fa gilUana Richardson, Proc. U. S. Nat. Mus., XXI, 1899, pp. 840-841; Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 185-186; American Nat- uralist, XXXIV, 1900, p. 224. Localities.—Catalina Island, California; Gualala, Mendocino County, California. Depth.—30-40 fathoms in sandy nmd. Body slightly attenuated in front. Color, light brown with markings of black. Head with anterior margin thickened and slightly- produced. Large median point triangularly shaped, on either side of which the frontal margin of the head is ))roadly lobed. Eye situated at the pos- terior angles of the head. F pair of antenn;e reach beyond the posterior margin of the head; tirst joint of peduncle is oblong; second joint very small; tiagellum consists of eight joints. The second pair of antenniv are broken in the specimens examined. The thoracic segments are abou
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