COPEPODS FROM EQUATORIAL WATERS OF PACIFIC OCEAN 



187 



Remarks : The forehead of the present spe- 

 cimen as well as the spination of certain of 

 the first four pairs of swimming feet differ 

 somewhat from Sewell's description. The fifth 

 pair of feet of Sewell's P. serrati'pes are similar 

 to those of P. dubia but the former is a larger 

 species (1.10 mm.). 



The small spinules on the distal end of the 

 terminal segment of the fifth feet can best be 

 seen under oil immersion. The other feet, ex- 

 cept the first pair, were also examined under 

 oil in order to ascertain the number of setae, 

 surface spines and lateral teeth on the various 

 segments. 



Only one specimen was obtained and this was 

 partly destroyed in the process of dissection. 



Acrocalanus longicornis Giesbrecht, 1888 



(Plate 5, figs. 1-16) 



Pacific records: Vervoort, 1946. Also, Yamada, 1933; 

 Mori, 1937; 1942; Wilson, 1942; 1950; Tanaka, 1953; 

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

 1955; Nagaya et al., 1955; Rose, 1955; Yamazi, 1955a; 

 Tanaka, 1956b; Honjo et al., 1957; Yamazi, 1958a. 



Vessel: Station Occurrence 



Hugh M. Smith __ 153 2 females, 1.20, 1.22 



mm. 



Do 31 1 female, 1.26 mm. 



Do 63 2 females, 1.19, 1.24 



mm. 



Stranger 34 7 females, 1.17-1.27 



mm. 



Remarks: The presence of a partial suture 

 between the head and first thoracic segment 

 (figs. 1, 2) and the spination of the swimming 

 feet, particularly the number of teeth (more 

 than 18) on the distal part of the third exopodal 

 segment of the fourth pair of feet (figs. 14, 

 16), distinguished this species from others in 

 the genus. 



Acrocalanus andersoni Bowman, 1958 

 (Plate 5, figs. 17-20; Plate 6, figs. 1-6) 

 Pacific records: None. 



Vessel: Statioyi Occurrence 



Stranger 34 1 female, 0.95 mm. 



Orsom 10 3 females, 1.12-1.17 



mm. 

 Kagoshima 613 1 female, 1.12 mm. 



Remai-ks: This species was recently de- 

 scribed from specimens obtained from the south 

 Atlantic coast of the United States (Bowman, 

 1958). It is recognized by the lack of partial 

 suture between the head and first thoracic seg- 

 ment (figs. 17, 18) and the number of latei-al 

 teeth (11) on the distal part of the third ex- 

 opodal segment of the fourth pair of feet (fig. 

 6). 



Acrocalanus monachus Giesbrecht, 1888 



(Plate 6, figs. 7-9) 



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

 1937; 1942; Wilson, 1942; 1950; Tanaka, 1953; Tsu- 

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

 1955. 



Vessel : Station Occurrence 



Stranger 34 2 females, 1.02, 1.05 



mm. 



Orsom 10 1 female, 1.00 mm. 



Horizon 32 3 females, 1.00-1.10 



mm. 



Remarks: The truncate appearance of this 

 species in lateral view (fig. 8) readily distin- 

 guishes it from others in the genus. 



Calocalanus pavo (Dana, 1849) 



(Plate 6, fig. 10) 



Pacific records: Vervoort, 1946. Also, Yamada, 

 1933a; Mori, 1937; Johnson, 1942; Mori, 1942; Wilson, 

 1942; 1950; Tanaka, 1953; Yamazi, 1953b; 1953c; 

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

 1954d; Brodsky, 1955; Chiba, Tsuruta, and Maeda, 

 1955; Nagaya et al., 1955; Rose, 1955; Yamazi, 1955d; 

 Chiba, 1956; Tanaka, 1956b; Heinrich, 1957b; Honjo 

 et al., 1957; Heinrich, 1958b; Yamazi, 1958a; 1958b. 



Vessel: Station Occurrence 



Hugh M. Smith __ 153 1 female, 0.85 mm. 



Do 63 1 female, 1.00 mm. 



Stranger 34 1 female, 1.19 mm. 



Orsom 10 1 female, 0.97 mm. 



Horizon 32 ____ 1 female, 1.00 mm. 



Remarks: Bernard (1958) has recently re- 

 vised the genus Calocalanus based on material 

 collected in the Bay of Algiers. She proposed 

 the family Calocalanidae, which consists of the 

 genus Calocalanus s. str. and two new genera, 

 Leptocalamis and Dolichocera. She has also 



