198 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Oncaea conifera Giesbrecht 



[Onciiea conijcra Giesbrecht, Atti R. Accad. Lincei, Rome, ser. 

 4, vol. 7, sem. I, p. 477, i8gi; Fauna und Flora des Golfes 

 von Neapel, vol. ig, pp. 591, 603, pi. 2, fig. 10; pi. 47, figs. 4, 

 16, 21, 23, 28, 34-38, 42, 55, 56, 1892.] 



This species was found at three stations in the Caribbean 

 Sea and was well scattered in the Pacific, especially in the 

 southeastern region. It was taken in i nocturnal and 4 di- 

 urnal surface tows, 10 50-meter tows, and 15 loo-meter tows, 

 and in the vertical tow from 1000 meters at station 64. More 

 than half the abundance records were numerals, indicating 

 that the species is nowhere plentiful. It is, however, rather 

 widely distributed, and has been reported from nearly every 

 ocean, including the Arctic and Antarctic. Farran in his 

 account of the Copepoda of the Terra Nova expedition 

 (1929, p. 285) recorded it as "taken three times in hauls 

 beneath the ice." 



Oncaea curta Cj. O. Sars 



[Oncaea curta G. O. Sars, Bull. Inst, oceanogr. Monaco, no. 

 323, p. II, pi. 4, 1916.] 



Found between stations i and 2 and at three stations in 

 the central tropical Atlantic, and in every region of the 

 Pacific, but in small numbers and with numerous gaps in 

 its distribution. It was taken in 15 nocturnal and 19 diurnal 

 surface tows, 24 50-meter tows, and 24 loo-meter tows, and 

 in the vertical tow from 1000 meters, station 64. This record 

 suggests considerable indifference to light with a slight 

 preference for the two deeper tows. As far as is known, this 

 is the first record of the species outside the Mediterranean, 

 where it was originally obtained. The relative size of the 

 genital segment as compared with the rest of the urosome 

 was given by Sars (19 16, p. 11) as the most evident char- 

 acter of the species. 



Oncaea curvata Giesbrecht 



(Figure 45) 



[Oncaea curvata Giesbrecht, Res. voyage S.Y. Belgica, 1897-99, 

 Copepoden, p. 42, pi. 13, figs. 12-17, 1902.] 



Not present in the Atlantic plankton, and in the Pacific 

 confined to stations 35 to 61, with a single exception. It was 

 taken in i nocturnal and i diurnal surface tow, 4 50-meter 

 tows, and 4 loo-meter tows. In every instance the number of 

 specimens was very small, and the species is evidently rare. 

 Farran in his account of the Copepoda of the Terra Nova 

 expedition (1929, p. 286) stated that this species was "fre- 

 quent in the Antarctic, especially under the ice at Winter 

 Quarters." 



Oncaea dentipes Giesbrecht 

 (Figure 49) 



[Oncaea dentipes Giesbrecht, Atti R. Accad. Lincei, Rome, ser. 



4, vol. 7, sem. I, p. 477, 1891; Fauna und Flora des Golfes 



von Neapel, vol. 19, pp. 591, 603, pi. 47, figs. 7, 17, 41, 51, 



52, 1892.] 



A single female was taken in the 100-meter tow at station 



55, and this was the only record for the cruise. It was 



originally reported by Giesbrecht (1891, p. 477; 1892, p. 591) 



from nearly the same locality, and one specimen was ob- 

 tained in the Terra Nova plankton (Farran, 1929, p. 286) 

 off New Zealand in a vertical haul from 100 meters depth. 



Oncaea media Giesbrecht 



[Oncaea media Giesbrecht, Atti R. .^ccad. Lincei, Rome, ser. 4, 



vol. 7, sem. I, p. 477, 1891; Fauna und Flora des Golfes von 



Neapel, vol. 19, pp. 591, 602, pi. 2, fig. 12; pi. 47, figs, i, 11, 



^9-33- 40, 189:^.] 



Well distributed in both oceans except in the northern 



regions. It was taken in 24 nocturnal and 36 diurnal surface 



tows, 39 50-meter tows, and 37 loo-meter tows, and in the 



vertical tow from 1000 meters at station 64. It was repeatedly 



found in similar abundance in all three tows at the same 



time, and hence must be regarded as practically indifferent 



to hght. It was found at the surface so often in the daytime 



that its presence there at night can scarcely be regarded as 



evidence of migration. 



Oncaea mediterranea Claus 



(Figure 44) 



[Oncaea mediterranea Glaus, Die freilehenden Copepoden, p. 

 159, pi. 30, figs. 1-7, 1863.] 



Not present in the Atlantic plankton, and in the Pacific 

 found chiefly at stations 54 to 65. It was taken in 14 noc- 

 turnal and 3 diurnal surface tows, 9 50-meter tows, and 12 

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

 station 64. It is found almost entirely in the two deeper tows 

 during the daytime, but migrates to the surface at night. It 

 was recorded by Farran (1929, p. 285) as "scarce in the 

 Adantic but common off New Zealand. Most of the New 

 Zealand specimens retained their orange or golden color 

 after preservation." This last statement is also true of the 

 Carnegie specimens, many of which were still very brightly 

 colored after four years in formalin. 



Oncaea minuta Giesbrecht 



(Figure 47) 



[Oncaea minuta Giesbrecht, Fauna und Flora des Golfes von 

 Neapel, vol. 19, pp. 591, 603, pi. 47, figs. 3, 6, 26, 46. 59, 

 1892.] 



This is one of the most widely distributed and abundant 

 species of the genus in both oceans. It was taken in 33 noc- 

 turnal and 63 diurnal surface tows, 106 50-meter tows, and 

 102 lOO-meter tows. It was recorded as abundant one hun- 

 dred times and as common one hundred times more. It 

 showed a definite preference for the two deeper tows in the 

 daytime, but migrated regularly to the surface at night. 



Oncaea notopa (Giesbrecht) 

 (Figure 46) 



\Oncaea notopus Giesbrecht, Atti R. Accad. Lincei, Rome, ser. 

 4, vol. 7, sem. I, p. 477, 1891; Fauna und Flora des Golfes 

 von Neapel, \ol. 19. pp. 591, 603, pi. 47, figs. 12, 15, 4s, 

 1892.1 



Found at only lour Atlantic stations, but more widely 

 scattered in the Pacific, with numerous and extensive gaps 



