240 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
planktons. It has never been reported in any abundance and the fact 
that the few specimens obtained have generally been taken in deep 
vertical hauls would suggest that it usually stays some distance below 
the surface. The fifth leg of the female shown in figure 120 indicates 
the size of the long spine on the inner margin of the second exopod 
segment, one of the distinctive characters of this species. 
HETERORHABDUS NORVEGICUS (Boeck) 
Heterochaeta norvegica Borck, Forh. Vid. Selsk., Christiania, vol. 14, p. 40, 1872. 
Stations 2; 42; 470; 4687 34701; 4705 ; 4707; 5185 ; 5283 ; 5234. Iden- 
tified by Sars from 5 of these 10 Albatross stations and from 40 
Monaco stations and present also in the Carnegie plankton. All but 
the first two of the Albatross stations are located in the tropical Paci- 
fic. The specific name suggests that this is a northern form and ex- 
tends even into the Arctic Ocean. Station 2 is located in the North 
Atlantic between the southern United States and Bermuda, and sta- 
tion 42 is north of the Aleutian Islands. 
HETERORHABDUS PAPILLIGER (Claus) 
Heterochaeta papilligera Cxiaus, Die freilebenden Copepoden, p. 182, pl. 32, figs. 
10-18, 15, 1863. 
Stations 1; 2; 18; 49; 52; 65; 75; 3799; 3878 ; 4634; 4652; 4700; 4715; 
4719; 4721; 4722; 4725; 47380; 4753; 4759; 4760; 4785; 5120; 5129; 
5185; 5227; 5231; 5233; 5263; 5320; 5422; 5487; 5489. Identified by 
Sars from 14 of these 32 Albatross stations and from 87 Monaco sta- 
tions and found also in the Siboga and Carnegie planktons. 
HETERORHABDUS ROBUSTUS Farran 
Heterorhabdus robustus FAarRAN, Fisheries Ireland, Sci. Invest. for 1906, pt. 2, 
p. 65, pl. 7, figs. 1-10, 1908. 
Stations 4574; 4634; 5185; 5231. Identified by Sars from the sec- 
ond of these stations and from 7 Monaco stations but not present in 
the other planktons. Since all the previous specimens have been cap- 
tured in the Atlantic and Antarctic Oceans, this is the first record from 
the Pacific. 
HETERORHABDUS SPINIFRONS (Claus) 
Heterochaeta spinifrons Ciaus, Die freilebenden Copepoden, p. 182, pl. 32, figs. 
8, 9, 14, 16, 1863. 
Stations 86; 65; 71; 80; 470; 4574; 4646; 4655; 4671; 4685; 4701; 
4721; 4722; 4730; 5129; 5184; 5185; 5231; 5233; 5246; 5263; 5320; 
5437; Fiji Islands. Identified by Sars from 7 of these Albatross sta- 
tions and from 37 Monaco stations and found in the Challenger, 
Siboga, and Carnegie planktons. 
