240 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



two characters plus the structure of the fifth 

 feet (fig. 10) will identify the female. No 

 male was found in the present collections. 



Pontellvia pliimata (Dana, 1849) 

 (Plate 84, figs. 11-15) 



Pacific records: Scott, 1909; Farran, 1929; 1936; 

 Mori, 1937; Dakin and Colefax, 1940; Mori, 1942; Wil- 

 son, 1950; Anraku, 19.52; Tanaka, 1953; Anraku, 

 1954b; Tsuruta and Chiba, 1954b; Chiba, Tsuruta, and 

 Maeda, 1955 ; Motoda and Anraku, 1955 ; Nagaya et 

 al., 1955; Chiba, 1956; Heinrich, 1958a; Yamazi, 1958a. 



Vessel: Station Occurrence 



Do 30 9 females, 1.43-1.84 



mm.; 1 male, 1.56 

 mm. 



Do 31 2 females, 1.62, 1.80 



mm. 



Do 63 present. 



Stranger 34 2 females, 1.56, 1.63 



mm. 



Orsom 10 present. 



Horizon 32 present. 



Remarks: The female is distinguished by 

 the symmetrically pointed posterior margins of 

 the last thoracic segment (fig. 11) and the 

 right furca. This furca is fused to the anal 

 segment. The posterior lateral margins of the 

 last thoracic segment of the male are rounded 

 (figs. 13, 14) and the right fifth foot is chelate 

 (fig. 15). 



Family ACARTIIDAE 



Acartia daiiae Giesbrecht, 1889 



(Plate 34, fig. 16) 



Pacific records: Scott, 1909; Farran, 1929; 1936; 

 Mori, 1937; Dakin and Colefa.x, 1940; Johnson, 1942; 

 Mori, 1942; Wilson, 1942; Davis, 1949; Wilson, 1950; 

 Anraku, 1952; Tanaka, 1953; Anraku, 1954b; Motoda 

 and Anraku, 1955; Heinrich, 1957b; Honjo et al., 1957; 

 Heinrich, 1958a; Yamazi, 1958a; 1958b. 



Vessel: Station Occurrence 



Hugh M. Smith 94 present. 



Do 132 1 female, 1.12 mm. 



Do 178 present. 



Remarks: The female has a large spine on 

 the first segment of the first antennae and the 

 posterior lateral margins of the thorax end in 

 a large point. The external seta on the fifth 

 foot (fig. 16) is slightly more than twice the 

 length of the internal spine. 



Acartia negligeiis Dana, 1849 



(Plate 34, fig. 17) 



Pacific records: Scott, 1909; Farran, 1929; 1936; 

 Mori, 1937; 1942; Wilson, 1942; 1950; Anraku, 1952; 



Honjo, 1952; Tanaka, 1953; Anraku, 19.54b; Tsuruta 

 and Chiba, 1954b; Chiba, Tsuruta, and Maeda, 1955; 

 Motoda and Anraku, 1955; Nagaya et al., 1955; Chiba, 

 1956; Heinrich, 1957b; 1958a; Yamazi, 1958a; 1958b. 



Vessel: Statioji Occurrence 



Hugh M. Smith __ 153 2 females, 1.05, 1.10 



mm. 



Do 178 present. 



Do 30 10 females, 1.08-1.21 



mm. 



Do 31 5 females, 1.10-1.17 



mm. 



Do 63 present. 



Stranger 34 2 females, 1.08, 1.12 



mm. 



Orsom 10 14 females, 1.10-1.16 



mm. 

 Satsiima 32 present. 



Remarks: In contradistinction to A. danae, 

 the posterior lateral margins of the last thoracic 

 segment have a series of very small points. 

 The external seta on the fifth foot (fig. 17) is 

 more than four times the length of the internal 

 spine. 



