52 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



GAETANUS KRUPPII Giesbrecht 

 FlQUEE 32 



Gaetaniis kruppii Giesbrecht, Mittheil. Zool. Stat. Neapel, vol. 16, p. 202, pi. 7, 

 fig. 8, pi. 8, fig. 29, 1903. — VAN Breemen, Nordisches Plankton, Zoologischer 

 Teil, vol. 4, Entomostraca, Copepoden, p. 41, fig. 47, 1908. 



Occurrence. — A male and female from the trawl wings, Station 



2195, Albatross, south of Nantucket. 

 DistHhwtion. — Mediterranean (Giesbrecht) ; North and South 



Atlantic (Farran) ; Denmark Strait, Iceland, Faroe Islands (With) ; 



Malay Archipelago (A. Scott) ; Indian Ocean (Thompson). 



Color. — Body a uniform 

 bright carmine red, yellowish 

 along the grooves between the 

 segments ; plume on the basal 

 half of the first antennae 

 orange ; setae on the antennae, 

 mouth parts, and caudal rami 

 blue (Giesbrecht). 



Female. — Larger than the 

 preceding species; frontal 

 spine pointing ventrally ; 

 spines at posterior corners of 

 fifth segment mucronate and 

 not reaching center of genital 

 segment ; first antennae reach- 

 ing only three segments be- 

 yond the caudal rami; inner 

 distal corner of fourth basi- 

 pod with 25 to 30 stiff 



Figure 32, — Oaetanus kruppii: a. Female, lat- 

 eral ; 6j male, fifth legs 



bristles chiefly on the posterior surface. Total length, 3.6-4.5 mm. 



Male. — Spines at posterior corners of fifth segment much shorter 

 than in the female ; anal segment also much shortened ; first antennae 

 not reaching the caudal rami, their basal half with numerous short 

 colored aesthetasks on the anterior margins ; no bristles on the fourth 

 basipods; fifth legs biramose, endopods 1-segmented, right exopod 

 2 or 3 segmented, left exopod 3-segmented. Total length, 3.7-5 mm. 



BcTnarks. — This is a deep-water species and rather widely distrib- 

 uted, but it has never before been reported from our American coasts. 

 It may be distinguished from the preceding species by the fact that 

 the frontal spine is turned ventrally at right angles to the body axis. 



Genus GAIDIUS Giesbrecht, 1895 



Head fused with the first segment ; fourth and fifth segments also 

 fused, with spines at the posterior corners; urosorae 4-segmented in 



