192 



COPEPODS OF LAST CRUISE OF CARNEGIE 



Lubbockia squillimana Claus 



[Lubbocl{ia squillimana Claus, Die freilebcnden Copepoden, 

 p. 164, pi. 25, figs. 1-5, 1863.] 



Well distributed in the Sargasso and Caribbean regions 

 and in all the regions of the Pacific except the north (stations 

 116 to 132) and the south (stations 57 to 65). It was present 

 in I nocturnal surface tow, 30 50-meter tows, and 33 100- 

 meter tows, but did not appear at all in a diurnal surface 

 tow. It is shorter and stouter than acideata, and the posterior 

 margins of the urosome segments are smooth. In the Siboga 

 plankton it was taken once in a nocturnal surface tow. 



Genus LUCICUTIA Giesbrecht, 1898 



Two of the species of this genus were very widely dis- 

 tributed, one was confined to a single station, another was 

 found at two stations only, and a fifth was rather rare but 

 found in both oceans. All six of the species are practically 

 confined to the two deeper tows and appear at the surface 

 not at all or in such small numbers as to be negligible. 



Uj 



^ 50 - 



Chart ii. Daytime vertical distribution of species of Lnciciitia: 

 (i) biconittta, (2) clausii, (3) ciirta, (4) flavicornis , (5) grandis, 

 (6) longicornis. One of the species was confined to the 100-meter 

 tow, one appeared only in the two deeper tows, one was taken at 

 the surface and 100 meters only, and the other three were most 

 abundant in the 100-meter tow. 



Lucicutia bicornuta Wolfenden 



[Liicictitia biconiiita Wolfenden, Deut. Siidpolar-Exped., igoi- 

 1903, vol. 12, Zool., vol. 4, p. 321, fig. 630-^, 191 1.] 



Not found in the Atlantic plankton, but obtained at three 

 widely separated stations in the Pacific. The total number 

 of specimens was 5, 3 of which were taken in the 100-meter 

 tow and 2 in the 50-meter tow. Hence, so far as these few 

 individuals are concerned the species is negative to light. It 

 is evidently not abundant anywhere, since the majority of 

 the specimens thus far recorded have been single indi- 

 viduals. It was first reported and has since been found 

 chiefly in the temperate Atlantic. 



Lucicutia clausii (Giesbrecht) 



(Figure 54) 



[Leucl{artia clausii Giesbrecht, Atti R. Accad. Lincei, Rome, 

 ser. 4, vol. 5, sem. i, p. 812, 1889; Fauna und Flora des 

 Golfes von Neapel, vol. 19, pp. 359, 367, pi. 19, figs. 5, 6, 12- 

 14, 24, 26, 27; pi. 38, fig. 37, 1892.] 



This species was well distributed in both oceans except in 

 the northern regions and the extreme southern part of the 

 Pacific. It was present in 7 nocturnal and 2 diurnal surface 



tows, 28 50-meter tows, and 73 loo-meters tows, and in the 

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

 light and stays below the surface in the daytime, but migrates 

 upward at night. Six of the 8 specimens in the Siboga 

 plankton were taken in vertical hauls from 1000 to 2000 

 meters. 



Lucicutia curta Farran 

 (Figure 85) 



[Lucicutia curta Farran, Ann. Rept. Fisheries, Ireland, 1902-03, 

 pt. 2, app. 2, p. 44, pi. 12, figs. 1-7, 1905.] 



Two specimens were obtained from the surface tow at 

 station 54 and 2 from the loo-meter tow at station 74, and 

 these were the only records for the cruise. This species was 

 originally obtained in deep water off the coast of Ireland and 

 later in the Antarctic, and it is possible that it remains below 

 the loo-meter level in the daytime. But it evidently migrates 

 to the surface at night, and under favorable conditions may 

 stay long enough to be taken in the early forenoon. 



Lucicutia flavicornis (Claus) 



[Lcucl{artia flauicornis Claus, Die frcilebenden Copepoden, p. 

 186, pi. 32, 1863.] 



This was the most abundant and most widely distributed 

 species of the genus, but was not found in the extreme north 

 of the Atlantic or in the extreme south of the Pacific. It was 

 present in 2 nocturnal and 3 diurnal surface tows, 30 50- 

 meter tows, and 79 100-meter tows, and in the vertical tow 

 from 1000 meters, station 64. It is thus negative to light; 

 each of the daytime surface records was a single specimen, 

 whereas it was often abundant in the deeper tows. 



Lucicutia grandis (Giesbrecht) 



(Figure 87) 



[Lcuc\artia grandis Giesbrecht, Bull. Mus. Comp. Zool., 

 Harvard Coll., vol. 25, p. 258, pi. 4, fig. 4, 1895.] 



A few specimens of this species were found in the 100- 

 meter tow at station 31 in the Caribbean Sea, and this is the 

 only record for the cruise. The species, however, has been 

 reported by Sars (1925, p. 208) and Wolfenden (1911, p. 315) 

 as quite abundant in the temperate Atlantic at considerable 

 depths, and also from the tropical Pacific by Giesbrecht. 

 Farran (1929, p. 264) obtained 7 specimens in the Antarctic 

 in a vertical haul from 1000 meters. The large pad on the 

 ventral surface of the genital segment is a distinctive char- 

 acter. 



Lucicutia longicornis (Giesbrecht) 



[Lcticl^artia longicornis Giesbrecht, Atti R. Accad. Lincei, 

 Rome, ser. 4, vol. 5, sem. i, p. 813, 1S89; Fauna und Flora 

 des Golfes von Neapel, vol. 19, pp. 359, 367, pi. 19, figs. 7, 

 3o;pl. 38, fig. 39, 1892.1 



This species was found at three localities in the Sargasso 

 region and was widely scattered in the Pacific at stations 

 long distances apart. It was captured in 1 nocturnal and 2 

 diurnal surface tows, 3 50-meter tows, and 12 lOo-meter 

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

 Hence, though staying in deeper water during the daytime. 



