194 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Metridia curticauda Ciesbrecht 



[Mctiiilia airtiaiiidu Gifsbicclit, Atti R. Accad. Lincci, Rome, 

 ser. 4, vol. 5, sem. 2, p. 24, 1889; Fauna und Flora des Golfes 

 von Neapel, vol. 19, pp. 340, 346, pi. 32, fig. 7; pi. 33, figs. 4, 

 15. 33. 1892.] 

 Not found in the Pacific plankton and confined to two 

 localities in the eastern Atlantic. It was present in i noc- 

 turnal and I diurnal surface tow and i lOO-meter tow. 

 Farran (1929, p. 259) reported numerous specimens in the 

 Antarctic from depths of 600 meters or more, so this is 

 apparently a deep-water form, which does not often rise to 

 the loo-meter level in the daytime. 



Metridia longa (Lubbock) 



[Calanits longus Lubbock, Ann. and Mag. Nat. Hist., ser. 2, 

 vol. 14, p. 127, pi. 5, fig. 10, 1854.] 



Found at four Atlantic and six Pacific localities, the latter 

 chiefly in the western region. It was captured in 3 nocturnal 

 surface tows, 3 50-meter tows, and 7 loo-meter tows, and in 

 the vertical tow from 1000 meters, station 64; hence it is 

 negative to light and migrates to the surface in the night. It 

 has been reported by Sars (1925, p. 198) from the Arctic 

 Ocean as far north as Spitzbergen and seems to be a more 

 or less boreal form. 



Metridia lucens Boeck 

 (Figure 70) 



[Metridia lucens Boeck, Forhandl. Vidensk. Selsk. Christiania, 

 p. 238, 1865.] 



Found at a single Atlantic station (11) and at fifteen 

 Pacific stations, chiefly in the northern part above latitude 

 40° north. It was present in 7 50-meter tows and 10 100- 

 meter tows, and in the vertical tow from 1000 meters at 

 station 64, but was not found at the surface. The fifth legs 

 of the female are three-segmented, each end segment having 

 three terminal setae and one on the outer margin. 



Metridia princeps Giesbrecht 

 (Figure 102) 



[Metridia princeps Giesbrecht, Atti R. Accad. Lincei, Rome, 

 ser. 4, vol. 5, sem. 2, p. 24, 1889; Fauna und Flora des Golfes 

 von Neapel, vol. ig, pp. 340, 346, pi. 32, fig. 21; pi. 33, figs. 

 3, 18,35,40, 1892.] 



Not found in the Adantic plankton and confined to the 

 single vertical tow from 1000 meters at station 64 in the 

 southeastern Pacific, from which 3 females were obtained. 

 The fifth legs of the female are four-segmented, the basal 

 segment with a tuft of long filiform setae, the terminal seg- 

 ment with three plumose setae. 



Genus MICROCALANUS G. O. Sars, 190 1 

 Microcalanus pusillus G. O. Sars 

 [Microcalanus piisiUus G. O. Sars, Crustacea of Norway, \ol. 4, 

 p. 156, suppl. pi. 2, pi. 3, fig. I, 1903.] 



Abundant in the Sargasso and Caribbean regions and scat- 

 tered in every region of the Pacific, with five or six large 



gaps in the distribution. It was taken in 11 nocturnal and 10 

 diurnal surface tows, 39 50-meter tows, and 42 100-meter 

 tows. It migrates to the surface in the night and apparently 

 does not return immediately on the approach of daylight, 

 but is negative to strong light. 



Microcalanus pygmaeus (G. O. Sars) 



(Figure 55) 



[Psetidocalaritis pygmaeus G. O. Sars, Norwegian Nordi Polar 

 Exped., 1893-1896, Sci. res., vol. 5, Crustacea, p. 73, pi. 21, 

 1900.] 



Found at only two stations in the tropical Atlantic, but 

 more abundant than pusillus in the Pacific. It was present 

 in 12 nocturnal and 21 diurnal surface tows, 60 50-meter 

 tows, and 57 100-meter tows. Like the previous species, it 

 migrates to the surface in the night and lingers there in the 

 morning, but is negative to strong light. 



Genus MICROSETELLA Brady and Robertson, 1873 



Microsetella norvegica (Boeck) 



[Setella norregica Boeck, Forhandl. Vidensk. Selsk. Christiania, 

 p. 281, 1865.] 



Found at nearly every locality in the Adantic, but very 

 scattering in the Pacific. It was present in 7 nocturnal and 

 28 diurnal surface tows, 41 50-meter tows, and 32 loo-meter 

 tows. The minute size, the laterally compressed body, and 

 the short caudal setae are distinguishing characters. 



Microsetella rosea (Dana) 



[Canthocamptas roseiis Dana, U. S. E.xploring E.xped., 1838- 

 1842 (Wilkes), vol. 14, pt. 2, Crustacea, p. 1189, 1853; pi. 83, 

 fig. 10, 1855.] 



Very scattering in the Atlantic but abundant and widely 

 distributed in the Pacific. It was taken in 12 nocturnal and 

 43 diurnal surface tows, 83 50-meter tows, and 86 loo-meter 

 tows. It is probably negative to strong light and migrates to 

 the surface during the night. It is about twice the size of 

 norvegica and usually rosy in color, with caudal setae much 

 longer than the body. 



Genus MIRACIA Dana, 1846 



Miracia efferata Dana 



[Minicia efferata Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, 

 p. 46, 1849; U. S. Exploring Exped., 1838-1842 (Wilkes), 

 vol. 14, pt. 2, Crustacea, p. 1260, 1853; pi. 88, fig. 11, 185s.] 



This species was widely scattered in both oceans, but the 

 localities were long distances apart, and the abundance 

 records were nearly all numerals. It was present in 2 noc- 

 turnal and 19 diurnal surface tows, 19 50-meter tows, and 

 19 loo-meter tows. Such a uniform vertical distribution 

 strongly suggests that the species is indifferent to light. Very 

 often the bodies of the specimens preserved in formalin still 

 showed their original red and blue colors. 



