2IO 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Genus UNDEUCHAETA Giesbrccht, 1888 



Undeuchaeta major Giesbrecht 



[Undciichaeta major Giesbrecht, Atti R. Accad. Lincei, Rome, 

 ser. 4, vol. 4, sem. 2, p. 335, 1888; Fauna unci Flora des 

 Golfes von Neapel, vol. 19, pp. 227, 232, pi. 37, figs. 56, 57, 

 59. 189^-] 

 Not found in the Atlantic plankton, but present at live 

 localities in the Pacific. Three of these were nocturnal sur- 

 face tows, I was at 100 meters, and i was in the vertical 

 tow from 1000 meters at station 64; the species is thus nega- 

 tive to light but migrates to the surface at night. It was 

 originally obtained from the Pacific and afterward from the 

 North Atlantic, but is not abundant anywhere. 



Undeuchaeta plumosa (Lubbock) 



[Undina plumosa Lubbock, Trans. Entomol. Soc. London, 

 n. s., vol. 4, pt. I, p. 24, 1856.] 



Not found in the Atlantic plankton, but taken in the 

 Pacific in 2 nocturnal and 2 diurnal surface tows, 3 100- 

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

 64. It is known to be a deep-water species, which evidently 

 migrates to the surface at night and sometimes remains 

 there into the forenoon if the light is weak, but usually 

 migrates at least to the loo-meter level in the daytime. 



Genus UNDINOPSIS G. O. Sars, 1884 



Undinopsis bradyi G. O. Sars 



(Figure 135) 



[Undinopsis bradyi G. O. Sars, in ]. Spaare Schneider, Rept. 

 Invertebrata from the Kvaenangen Fjord, Tromso Mus. 

 Aarsh., no. 7, p. 131, 1884.] 



A single male was obtained in the loo-meter tow at 

 station 56 in the southeastern Pacific, and this was the only 

 record for the cruise. Only 3 specimens were obtained in the 

 Siboga plankton, and they were captured in two vertical 

 hauls from depths of 750 and 1500 meters. This is probably 

 a deep-water copepod which does not get up to the 100- 

 meter level very often in the daytime. Sars (1902, p. 32) 

 stated that it was always found close to the bottom and that 

 a light dredge must be used to capture it. 



Genus UNDINULA A. Scott, 1909 



Undinula caroli (Giesbrecht) 



[Ciilaniis caroli Giesbrecht, Atti R. Accad. Lincei, Rome, ser. 4, 

 vol. 4, sem. 2, p. 331, 1888; Fauna und Flora des Golfes von 

 Neapel, vol. 19, pp. 91, 127, pi. 8, fig. 36, 1892.] 



Not found in the Atlantic plankton, but present in all the 

 regions of the Pacific except the northern. It was taken in 9 

 nocturnal and 3 diurnal surface tows, 25 50-meter tows, and 

 19 loo-meter tows. It is thus negative to light and migrates 

 to the surface at night. The males can be distinguished from 

 those of daru'inii by the structure of the fifth legs, but the 

 females are so similar to those of darwinii that they can be 

 separated from the latter only by the most careful examina- 

 tion. A. Scott (1909, p. 18) is therefore probably right when 



he suggests that this difficulty in distinguishing the species 

 is the reason why it has not been recorded in larger numbers. 



Undinula darwinii (Lubbock) 

 (Figure 119) 



\Undina darwinii Lubbock, Trans. Linn. Soc. London, vol. 23, 

 p. 179. Pl- 29, figs. 4, 5, 1863.] 



Not found in the Atlantic plankton, but occurred at nearly 

 every locality in the Pacific except in the northern part. It 

 was taken in 28 nocturnal and 14 diurnal surface tows, 71 

 50-meter tows, and 73 loo-meter tows, and in the vertical 

 tow from 1000 meters at station 64. It is thus negative to 

 light and migrates regularly to the surface at night. With 

 most copepod species, when the sexes are unequal in size the 

 smaller sex arranges itself above the larger, but in this species 

 the larger females are found more often and in greater 

 numbers at the surface and in the 50-meter tow, and the 

 smaller males congregate at a lower level. 



Undinula vulgaris (Dana) 



[Undina vtdgaris Dana, Proc. Amer. Acad. Arts and Sci., vol. 

 2, p. 22, 1849; U. S. Exploring Exped., 1838-1842 (Wilkes), 

 vol. 14, pt. 2, Crustacea, p. 1092, 1853; pi. 77, fig. ia-d, 1855.] 



More widely distributed in the Atlantic than in the 

 Pacific plankon. It was taken in 8 nocturnal surface tows, in 

 which it was more abundant than in any of the diurnal 

 tows. In the daytime it was present in 11 surface tows, 23 

 50-meter tows, and 16 loo-meter tows. Like the preceding 

 species, it is negative to light and migrates to the surface 

 at night. 



Genus VALDIVIELLA Steuer, 1904 



Valdiviella minor Wolfenden 



[Valdii'iclla minor Wolfenden, Deut. Siidpolar-Exped., 1901- 

 1903, vol. 12, Zool., vol. 4, p. 249, pi. 29, figs. 8-1 1, 191 1.] 



Not found in the Atlantic plankton, and in the Pacific 

 present in i nocturnal surface tow and i loo-meter diurnal 

 tow, and in the vertical tow from 1000 meters, station 64. 

 There were 4 specimens in the surface tow and i in each of 

 the other tows. This suggests a deep-water species which 

 migrates to the surface at night but goes below the loo-meter 

 level in the daytime. 



Genus VETTORIA Wilson, 1924 



Vettoria granulosa (Giesbrecht) 



[Carina granulosa Giesbrecht, Atti R. Accad. Lincei, Rome, 

 ■ser. 4, vol. 7, sem. i, p. 479, 1891; Fauna und Flora des 

 Golfes von Neapel, vol. 19, p. 645, pi. 49, figs. 39-45: pi. 50, 

 figs. 53, 54, 1892.] 



Not found in the Atlantic plankton, and in the Pacific 

 confined chiefly to the southeastern and central regions. It 

 was taken in 2 nocturnal surface tows, 3 diurnal 50-meter 

 tows, and 12 diurnal 100-meter tows. It migrates at least 

 occasionally to the surface at night, and by day stays in the 

 two deeper tows, preferring the loo-meter level. 



