. Bulletin - United States National Museum. Science. 312 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Color.—Body very transparent, with ferruginous pigment vari- ously distributed through the cephalic segment, especially in the region around the mouth. The same pigment sometimes forms spots symmetrically arranged in the thorax, the abdomen, the long setae of the first antennae, the furca, and the swimming legs. Other individuals are quite colorless except for the ruby-red eye. Female.—Rostrum turned downward but at the same time ex- tended forward far enough to render it visible in dorsal vie
. Bulletin - United States National Museum. Science. 312 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Color.—Body very transparent, with ferruginous pigment vari- ously distributed through the cephalic segment, especially in the region around the mouth. The same pigment sometimes forms spots symmetrically arranged in the thorax, the abdomen, the long setae of the first antennae, the furca, and the swimming legs. Other individuals are quite colorless except for the ruby-red eye. Female.—Rostrum turned downward but at the same time ex- tended forward far enough to render it visible in dorsal view; caudal rami shorter than the anal segment but three times as long as wide; setae on the outer margin and the tip of each ramus densely plumose and highly colored. First antennae reaching the anal segment; outer margin spines of the three exopod segments of the first four pairs of legs: 1, 1, 2; 1, 0, 2; 1, 0, 1; 0, 0, 1; re- spectively. The setae on the basipods of the second, third, and fourth legs and on the sides of the fifth metasome segment project at right angles to the body axis and are visible dorsally. Total length, mm. Male.—Rostrum lacking; second abdom- inal segment about as wide as long, anal segment the same length as each of the two preceding segments. First antennae twice geniculate; the first segment beyond the promixal elbow sheathing the base of the segment in front of it, the first segment beyond the distal elbow with a semicircular process on its inner margin. End segment of first and fourth exopods with two outer spines, of second and third exopods with three outer spines. Total length, mm. Remarks.—This species may be recognized by the long and highly colored plumose setae mentioned in the foregoing descriptions. It is apparently a pelagic species and chiefly tropical in its distribution, and comes into the area around Woods Hole as a straggler from the south. OITHONA SPINIROSTRIS Clans FiGxmB 188 Oithona spinirostris Claxjs, Die f
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