214 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
EUCHAETA MARINA (Prestandrea) 
Cyclops marinus PRESTANDREA, Effemeridi Sci. e Lett. Sicilia, vol. 6, p. 12, 1833. 
Stations 1; 5; 6; 14-16; 18; 19; 24; 27; 30-32; 42; 44-46; 48; 52- 
55: 57, 59, 60, 65, 70, ee 75-78: 80; 173; 236; 2236; 9396: 3412; 8T12; 
3765 : 3789 ; 37915 3799 ; 3829 5 3834; 3867; 3878; "3901; 3911; 3912; 
3991 : 3927 : 3929 : 39305 3932 ; 3980; 4009-4011 ; 4037; 4086; 4190; 
4497 ; 4580; 4583; 4588 4590; 4592 ; 4594 4605 5 4607: 4611; 4613; 4615; 
4619; 4635 ; 4638; 4640 ; 4644; 4646; 4657; 4659 ; 4661 ; “A667 ; 4671; 
4673; 4681; "4684; 4687 ; 47005 4705-4709 ; 4713-4716; 4721 ; 4792 4794. 
4730; 4731; 4734; 473 8: 4915; 4926; 4959; 5102; 5108 ; 5120; 5129; 
5133; 5184; 5155; 51753 5185; 5186; 5190; 5196; 5293-5997 + 5299, 
5231; 5238; 5240; 5246; 5258; 5262; 5263; "5308; 5319; 5820; 5338; 
5340; 5342; 5348: 5358+ 5396; 5397; 5499 5434; 5437; 5451; 5489; 
5578; 5611; 5627; FijiIslands. Asshown above this is the most widely 
distributed species in the Albatross plankton and it is present in all 
the plankton lists. It frequents tropical and temperate regions of 
all oceans, often in abundance. 
EUCHAETA MEDIA Giesbrecht 
PLATE 22, FIGURES 323-325 
Euchaeta media Giessrecut, Atti Accad. Lincei, Rome, ser. 4, vol. 4, sem. 2, p. 337, 
1888; Fauna und Flora des Golfes von Neapel, monogr, 19, pp. 246, 263, pl. 16, 
figs. 13, 36; pl. 37, figs. 39, 40, 1892. 
Stations 3867; 4038; 5185; 5227. Established by Giesbrecht upon 
female specimens from the tropical Pacific, this species appeared in 
the Siboga plankton as a single female from the East Indies but was 
absent from the other lists. However, 40 females were recorded by 
Esterly (1905, p. 160) off the coast of California, about 2,700 were 
obtained by Farran (1929, p. 238) in the Terra Nova plankton, and 
Sewell (1929, p. 149) reported a few from the Bay of Bengal. But 
in spite of this abundance the male has hitherto remained unknown 
and is here described for the first time. Incidentally the statement 
by Scott that the distribution of this species is “very limited” must 
be given a strictly geographical and not at all a numerical 
interpretation. 
Female.—Metasome elliptical, three times as long as wide, much 
narrowed anteriorly, not as much posteriorly. Forehead with a notch 
above the rostrum, which extends almost horizontally forward, pos- 
terior corners of the last thoracic segment slightly but distinctly 
angular. Urosome two-fifths as wide as and three-fifths as long as the 
metasome and 4-segmented. Genital segment asymmetrical, swollen 
anteriorly on the left side and posteriorly on the right side with a 
large ventral protuberance having an irregular outline. The filiform 
