COPEPODS FROM EQUATORIAL WATERS OF PACIFIC OCEAN 



177 



Remarks: Most of the present specimens 

 have their f ureal setae eroded. Bowman (1955) 

 has previously observed this in specimens col- 

 lected from the northeastern Pacific. He at- 

 tributed this erosion to protozoan parasites 

 which were present in the furcae. The ma- 

 jority of my specimens also contain these para- 

 sites in the furcae. Bowman (1955) has fully 

 figured C. light i, a species which differs mor- 

 phologically from tenuicornis only in size. 



Nannocalanus minor (Glaus, 1863) 



(Plate 1, figs. 1-8) 



Pacific records: Vervoort, 1946. Also, as Calamts 

 minor; Yaniada, 1933a; Mori, 1937; 1942; Wilson, 

 1942; Anraku, 1952; Chiba, 1952c; Honjo, 1952; 

 Nakai, 1952; Tanaka, 1953; Yamazi, 1953a; 1953b; 

 1953c; Anraku, 1954b; Motoda and Anraku, 1954; 

 Tsuruta and Chiba, 1954b; Yamazi, 1954b; 1954d; 

 Chiba, Tsuruta, and Maeda, 1955; Hida and King, 

 1955; Jlotoda and Anraku, 1955; Nagaya et al., 1955; 

 Yamazi, 1955d; Chiba, 1956; Tanaka, 1956a; Honjo et 

 al., 1957; Yamazi, 1958a. As Nannocalamis minor; 

 Wilson, 1950; Brodsky, 1955; Rose, 1955; Heinrich, 

 1957b; 1958a; Brodsky, 1959. 



Vessel: Station Occurrence 



Hugh M. Smith __ 94 1 female, 1.73 mm. 



Do 132 14 females, 1.56-1.70 



mm.; 7 males, 

 1.39-1.43 mm. 



Do 144 1 female, 1.73 mm. 



Do 153 10 females, 1.58-1.67 



mm.; 3 males, 

 1.44-1.46 mm. 



Do 178 25 females, 1.51-1.65 



mm.; 12 males, 

 1.31-1.51 mm. 



Do 31 1 female, 1.75 mm. 



Do 29 1 female, 1.80 mm. 



Do 63 1 female, 1.80 mm. 



Stranger 34 6 females, 1.53- 



1.70 mm. 



Orsom 10 2 females, 1.58, 1.61 



mm.; 4 males 1.24- 

 1.46 mm. 



Horizon 32 9 females (stage 



V), 1.5.3-1.70 mm. 



Remarks: All the above female specimens 

 belong to N. minor f. ynajor (Sewell, 1929). 

 Although Sewell (1947) has recently recog- 

 nized two forms of the male (f. major and f. 

 minor) , I was unable to distinguish these forms 

 among the above specimens. Presumably, they 

 are all referable to f. major as Vervoort (1946) 



has reported smaller males (1.20-1.29) from 

 one Snelliii^ station (113) in Netherlands East 

 Indies. 



Canthocalanus pauper (Giesbrecht, 1888) 



(Plate 1, figs. 9-18) 



Pacific records: Vervoort, 1946. Also, as Calayius 

 pauper; Mori, 1937; 1942; Honjo, 1952; Yamazi, 1953a; 

 1953b; Anraku, 1954b; Johnson, 19.54; Tsuruta and 

 Chiba, 1954b; Motoda and Anraku, 1955; Nagaya et 

 al., 1955. As Canthocalanus pauper; Wilson, 1942; 

 1950; Tanaka, 1953; Brodsky, 1955; Rose, 1955; Ta- 

 naka, 1956a; Yamazi, 1958a. 



Vessel: Station Occurrence 



Hugh M. Smith ___ 63 1 female, 1.42 mm. 



Stranger 34 1 male, 1.31 mm. 



Orson 32 2 females, 1.42, 1.46 



mm.; 1 male, 1.36 

 mm. 



Remarks : This small copepod is most easily 

 recognized by the peculiarly shaped spine on 

 the second basipodal segment of the first pair 

 of feet (figs. 12, 13) in the female and the 

 structure of the fifth pair of feet (figs. 17, 18) 

 in the male. 



Neocalanus gracilis (Dana, 1849) 



(Plate 1, figs. 19-20) 



Pacific records: Vervoort, 1946; 1957. Also, as 

 Calaniis gracilis; Mori, 1942; Honjo, 1952; Tsuruta 

 and Chiba, 1954b; Motoda and Anraku, 1955; Nagaya 

 et al., 1955; Chiba, 19.56; Honjo et al., 1957. As 

 Neocalanus gracilis; Tanaka, 1953; Hida and King, 

 1955; Tanaka, 1956a; Yamazi, 1958a. 



Vessel: Station Occurrence 



Hugh M. Smith __ 94 present. 



Do 132 8 females (stage V), 



2.34-2.48 mm. 



Do 153 1 female, 3.09 mm. 



Do 31 2 females, 3.33 mm. 



Stranger 34 4 females, 3.01-3.06 



mm. 



Orsom 10 1 female, 2.96 mm. 



Satsuina 32 1 female, 2.11 mm. 



Remarks: Vervoort (1946) has listed the 

 differences between this species and Neocalanus 

 robustior (Giesbrecht). The adult females of 

 N. gracilis are smaller (maximum 3.33) and 

 the genital segment is less produced ventrally 

 (fig. 20). No males were encountered in the 

 present collections. 



