178 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
CALANUS HELGOLANDICUS (Claus) 
Cetochilus helgolandicus CLAus, Die freilebenden Copepoden, p. 171, pl. 26, figs. 
2-9, 1863. 
Station 37; 57; 4574; 4652; 4655; 4657; 4673; 4759. ‘This species 
appears in the Carnegie and Monaco planktons but not in the other 
lists. Sars, who identified these Albatross specimens, stated in the 
Monaco report (p. 6) that this is a more southern form than fin- 
marchicus and that it is never found in the Arctic Ocean but is widely 
distributed in all other regions. It is worthy of note that four of the 
above stations are located off the west coast of Peru in the current 
that flows north from the Antarctic. 
CALANUS HYPERBOREUS (Kr¢yer) 
Calanus hyperboreus Kr¢éyeR, Kong. Danske Vidensk. Selsk., Nat. math. Afh., vol. 
7, p. 310, pl. 4, fig. 28, 1838. 
Stations 31; 33; 2195; 3602; 4747; 4793; 4805; 4806; H. 2700. This 
species also appears in the Carnegie and Monaco planktons but not in 
the others. It is a boreal species found in the Arctic and northern 
Atlantic and Pacific Oceans often in company with finmarchicus. 
CALANUS TONSUS Brady 
Calanus tonsus Brapy, Voyage of H. M. 8. Challenger, Zool., vol. 8, pt. 23, Cope- 
poda, p. 34, pl. 4, figs. 8, 9, 1883. 
Stations 12; 80; 4758; 4766; 4793; 5030; 5246. Established by 
Brady upon specimens from the southern Pacific and Atlantic, it was 
recorded from one station in the Carnegie plankton but does not appear 
in the other lists. 
Genus CALIGUS Miiller, 1785 
CALIGUS CORYPHAENAE Steenstrup and Liitken 
Caligus coryphaenate STEENSTRUP and LUTKEN, Dansk. Vid. Selsk. Skriv., vol. 
5, p. 360, pl. 4, fig. 7, 1861. 
Station 4679. A single male of the parasitic species was captured 
swimming in the surface plankton at the above station. 
CALIGUS LATIFRONS Wilson 
Caligus latifrons WiLson, Proc. U. 8. Nat. Mus., vol. 28, pp. 587-589, pl. 12, figs. 
140-149, 1905. 
Stations 4952; 5223, 5460. Since only one female was taken at each 
of these stations and the male still remains unknown, this must be 
regarded as a rare species. Until taken by the Albatross this species, 
based upon a single female without data as to the host or locality, 
had not been reported since described by the present author. The 
