. Bulletin - United States National Museum. Science. 410 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 1. Abdomen 2-segmentecl, basal one-third as long as end segment; carapace as wide as long nordmanii (p. 411) Abdomen 1-segmented ; carapace distinctly longer than wide 2 2. Fourth legs reaching beyond tips of caudal rami; genital seg- ment not so wide as fourth segment hippoglossi (p. 412) Fourth legs scarcely reaching center of genital segment; the lat- ter wider than fourth segment 3 3. Genital segment obovate, widest anteriorly; spines on fourth legs flanged edwardsi (p. 412) Genital
. Bulletin - United States National Museum. Science. 410 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 1. Abdomen 2-segmentecl, basal one-third as long as end segment; carapace as wide as long nordmanii (p. 411) Abdomen 1-segmented ; carapace distinctly longer than wide 2 2. Fourth legs reaching beyond tips of caudal rami; genital seg- ment not so wide as fourth segment hippoglossi (p. 412) Fourth legs scarcely reaching center of genital segment; the lat- ter wider than fourth segment 3 3. Genital segment obovate, widest anteriorly; spines on fourth legs flanged edwardsi (p. 412) Genital segment orbicular, widest at its center; spines on fourth legs not flanged thompsoni (p. 410) LEPEOPHTHEIRUS THOMPSONI Baird FiGUKH 257 LepeoplitJieirus tliompsoni Baikd, The natural history of the British Ento- mostraca, p. 278, pi. 33, fig. 2, 1850.—Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 619, pi. 18, 1905. Occun^ence.—Both sexes found on outside surface of goosefish at Woods Hole by Vinal Edwards in 1904. Distribution.—British seas (Baird, T. Scott, Bassett-Smith, White); Mediterranean (Brian); Faroe IsLands (Hansen); Kattegat and North Sea (Kr0yer); Bohuslan (Malm, Olsson); La JoUa, Calif. (Wil- son). Color.—Body a uniform light yellow, turning dark brown in preservatives. Female.—Carapace a little wider than long and less than half the entire length; fourth segment less than half the width of the genital segment, strongly nar- IW"!^ ' '1^ rowed in front of the fourth legs; geni- 1 ' tal segment flask-shaped, narrowed ante- riorly, emarginate posteriorly, with broad lobes but no leg rudiments. Abdomen 2-segmented, the basal seg- ment four times as long as the terminal; caudal rami minute and widely sepa- rated. Furca large and broadly U-shaped; fourth legs 4-segmented, with four spines and a seta. Total length, mm. Male.—Carapace elliptical, longer than wide, and much more than half the entire length; fourth segment spindle shaped; genital seg- men
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