174 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Table 2. — List of species and number of specimens in each sub-sample — Continued 



["X" indicates the species was found during the examination of other fractions of original sample] 



completing the analysis of the sub-sample, por- 

 tions of the original sample were examined for 

 species not found in the aliquot. The species 

 in each sample are listed in table 2 along with 

 the number of specimens of each found in the 

 aliquot. 



Representatives of most species from each 

 station were segregated by sex and placed in 

 labeled vials. This material will be deposited 

 in the U.S. National Museum. 



GENERAL REMARKS 



Species composition 



A total of 110 species of calanoid copepods 

 was found in the samples (table 2). Of these, 

 three species belonging to the genera Xantho- 

 calanus, Amallophora, and Scolecithricella are 

 described as new, and three species, Acro- 

 calanus andersoni, Chirundina indica, and Hal- 

 optilus fertilis, are reported for the first time 

 from the Pacific Ocean. 



The collections examined were obtained from 

 along the Equator from 120° W. to 130° E., a 

 distance of approximately 5,800 miles (fig. 1). 

 Many of the species were widely distributed 

 and occurred in samples collected in the eastern 

 Pacific (east of 170° W.) and those collected 



in the western Pacific (west of 170° W.). Dis- 

 regarding the small collection made at Kago- 

 shima station 613, the most frequently occur- 

 ring species were Nannocalanus minor, Un- 

 dinula darwini, Clausocalaniis arcuicornis, and 

 Scolecithrix danae. These four species were 

 present in all but one or two samples. 



A study of table 2 will reveal that there 

 were at least 6 species which were frequently 

 found (4 or more samples) in the eastern Pa- 

 cific, but which were not found in the samples 

 examined from the western Pacific. One of 

 these, Eucalanus subtenuis, was the most abun- 

 dant copepod in three of the eastern Pacific 

 samples and its apparent absence from the 

 western Pacific samples is noteworthy. It is 

 not, however, restricted to the eastern Pacific, 

 as it has been reported from Japan (Fukase, 

 19.57 ; Tanaka, 1956a) and from the Dutch East 

 Indies (Vervoort, 1946). The other eastern 

 Pacific species have also been reported from 

 these two areas. 



Equatorial undercurrent samples 



Four of the fourteen samples examined were 

 obtained from within the equatorial current 

 (Smith 94, 144, 178, 31). The species compo- 

 sition of these samples, when compared with 



