. Bulletin - United States National Museum. Science. Distribution.—British Isles (T. Scott); coast of Norway (Sars). Color.—Body transparent with a whitish tinge and without pig- ment markings; becoming opaque white in formalin; no eye visible. Female.—Metasome and urosome about the same length and not sharply differentiated; cephalic segment pointed anteriorly; anal segment as long as penultimate segment; caudal rami longer than wide and squarely truncated at the tips. Two basal segments of first antennae enlarged and together nearly as long as the rest of the appendage; basal seg- ment of se
. Bulletin - United States National Museum. Science. Distribution.—British Isles (T. Scott); coast of Norway (Sars). Color.—Body transparent with a whitish tinge and without pig- ment markings; becoming opaque white in formalin; no eye visible. Female.—Metasome and urosome about the same length and not sharply differentiated; cephalic segment pointed anteriorly; anal segment as long as penultimate segment; caudal rami longer than wide and squarely truncated at the tips. Two basal segments of first antennae enlarged and together nearly as long as the rest of the appendage; basal seg- ment of second antenna not divided, the exopod attached to its side near the center; distal segment of first endopod as long as basal segment, twice the length of the second segment; distal segment of fifth legs twice as long as wide, narrowed apically, with six setae, the outer apical one filiform; basal ex- pansion reaching center of distal seg- ment, with five setae, the second outer one twice the length of the others. Total length, mm. Male.—Smaller and more slender than the female; first antennae 9-seg- mented, geniculate, the terminal portion made up of three broad segments, the aes- thetask as bi'oad as these terminal seg- ments and as long as the entire antenna. The rami of the first legs are equal; the basal endopod segment is slightly longer than the two distal segments, which are themselves equal in length; the middle exopod segment has an inner seta. The fifth legs are much reduced in size, the basal expansion scarcely reaches beyond the base of the distal segment and is armed with three equal setae; the distal seg- ment is twice as long as wide, with six setae, the third outer one filiform. Total length, mm. Remarks.—This is a littoral form and has been found hitherto only on i\\% Scottish and Norwegian coast. The short first antennae and the fifth legs in both sexes are the best distinguishing characters. AMEIRA TAU (Giesbrecht) Figure 163 Nitocr
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