i86 



COPEPODS OF LAST CRUISE OF CARNEGIE 



loo-meter tow, and in the vertical tow from a depth of looo 

 meters at station 64. The genital segment of the female is 

 asymmetrical, with a posterior outgrowth on the left side. 

 The first basipod of each fourth leg has two small spines on 

 the inner margin. 



Euchirella pulchra (Lubbock) 



[Uiulina pulchra Lubbock, Trans. Entomol. Soc. London, n. s., 

 vol. 4, pt. I, p. 20, 1856.] 



Found at stations i and 27 in the Atlantic and in every 

 region of the Pacific except the north, but at widely separated 

 localities. Taken twice in the surface tow, 7 times in the 50- 

 meter tow, and 7 times in the loo-meter tow. Nine of these 

 records were single specimens and four others were numerals; 

 these correspond well to A. Scott's { 1909, p. 56) records of 

 the Sihogci plankton, the largest of which was 6 specimens. 

 These few records indicate that it is more or less negative 

 to light. 



Euchirella rostrata (Claus) 



[Uiulina rostrata Claus, Die Copepoden-Fauna \'on Nizza, p. 

 II, pi. I, fig. 10, 1866.] 



Found at four stations in the Atlantic, two of which were 

 in the far north, and at six stations in the southeastern 

 Pacific. Taken 5 times in the 50-meter tow, 5 times in the 

 lOO-meter tow, and once in the vertical tow from 1000 

 meters, station 64, but not at all at the surface. Eight of these 

 records consisted of numerals and the other three were 

 designated as rare (r). As far as they go, they indicate a 

 negative phototropism for the species, with limited nocturnal 

 migration. 



Genus EUTERPINA Norman, 1903 

 Euteipina acutifrons (Dana) 



[Harpacliciis acutifrons Dana, Proc. Amer. .^cad. Arts and Sci., 

 vol. I, p. 153, 1847; U. S. Exploring Exped., 1838-1842 

 (Wilkes), vol. 14, pt. 2, Crustacea, p. 1192, 1853; pi. 83, fig. 

 ua, b, 1855.] 



Not present in the Atlantic plankton, but found at four 

 stations in the southeastern Pacific. It was taken once in the 

 surface tow, 3 times in the 50-meter tow, and 3 times in the 

 loo-meter tow. Four of these records were single specimens, 

 two more were 2 specimens each, and the seventh was 4 

 specimens. This harpactid is probably negative to strong 

 light. This species has been reported by Cleve (i 900-1 901, 

 p. 143; 19000, p. 7; 1900^, p. 65; as Euterpe acutifrons) from 

 both the North and South Atlantic, and by Esterly (1905, 

 p. 212) as abundant in the Pacific in the San Diego region, 

 California. It was also reported by Sewell ( 1924, p. 836) 

 from Chiika Lake, a brackish lagoon on the west coast of 

 British India, so that it is not wholly pelagic. 



Genus FARRANULA (Blake MS) Wilson, 19326 



The generic name Corycella proposed by Farran (1911, 

 p. 284) for these small cyclopids had been preoccupied by 

 Leger in 1892 for a genus of Protozoa, and Charles H. Blake 



suggested in manuscript the name Farranida in place of it. 

 This was adopted and published by the present author 

 ( 1 9326, p. 594, footnote). 



This is essentially a tropical genus, and is widely dis- 

 tributed over the warmer regions of all oceans between 

 latitudes 40° north and 40° south. The species belonging to 

 the genus are among the smallest copepods known, less than 

 a millimeter in length, but they make up in numbers what 

 they lack in size, and often constituted the bulk of the sur- 

 face copepod plankton. 



■i: 50- 



°~. 100 



Chart 8. Daytime vertical distribution of species of Farraniila: 

 (i) carinata, (2) concinna, (3) curta, (4) gibbula, (5) gracilis, 

 (6) rostrata. Five species were found somewhat more often at the 

 surface, less often in the 50-meter tow, and least often in the 100- 

 meter tow. The sixth species was found least often in the 50- 

 meter tow, more often in the 100-meter tow, and most often at 

 the surface. According to these Carnegie records, therefore, the 

 species were all positive to light, but the attraction was very 

 weak. The differences in the number of times each species was 

 present, and in its relative abundance, at the three depths were 

 very small. The two most abundant species frequently showed no 

 differences at all in vertical distribution. 



Farranula carinata (Giesbrecht) 



[Corycaeus carinatiis Giesbrecht, Atti R. Accad. Lincei, Rome, 

 ser. 4, vol. 7, sem. i, p. 481, 1891; Fauna und Flora des Golfes 

 von Ncapel, vol. 19, pp. 661, 675, pi. 50, fig. 20, 1892.] 



The gaps in the distribution of this species were from 

 station 6 to 13 in the North Atlantic, 42 to 45 in the eastern 

 Pacific, 58 to 6r in the South Pacific, and 115 to 128 in the 

 North Pacific. It was taken in 21 nocturnal and 100 diurnal 

 surface tows, 86 50-meter tows, and 72 loo-mcter tows. It 

 was repeatedly found in two of the tows and often in all 

 three at the same station, and more or less equally distrib- 

 uted. It was recorded as abundant more than a hundred 

 times, and surpassed any other single species of the genus in 

 the number of specimens obtained. 



Farranula concinna (Dana) 



(Figure ^i) 



[Corycaeus concinnus Dana, Proc. Amer. Acad. Arts ami Sci., 

 vol. 2, p. 39, 1849; U. S. Exploring Exped., 1838-1842 

 (Wilkes), vol. 14, pt. 2, Crustacea, p. 1225, 1853; pi. 86. fig. 

 7". b. 1855.] 



Not present in the Atlantic plankton; in the Pacific it was 

 taken in 8 nocturnal and 10 diurnal surface tows, 6 50-mcter 

 tows, and 5 100-meter tows. It was recorded but once as 

 abundant and five times as common. Nearly ail the speci- 



