The distal portions of the swimming legs 

 were missing in all specimens. 



Calaruis tenidcornis Dana, 1849 

 Occurrence 



Sta. 3. 10 adult females, 1.71 to 1.83 mm. 



Sta. 5. 17 adult females, 1.68 to 2.04 



mm.; 1 adult male, 1.88 mm. 



Sta. 7. 13 adult females, 1.78 to 2.22 mm. 



Sta. 9. 2 adult females, 1.90 to 1.98 mm. 



Sta. 13. 5 adult females, 1.88 to 2.22 mm. 



Sta. 15. 1 adult female, 1.91 mm. 



Remarks 



This species can easily be recognized by the 

 elongate antennules and the absence of the 

 hooked spiniform process on the anterior as- 

 pect of the basis of the first leg that appears in 

 the species of Neocalauvs. 



Most of the present specimens, like those 

 observed by Bowman (1955) and Grice (1962), 

 had protozoan parasites in the caudal rami and 

 the setae were consequently eroded. 



Bowman (1955) found that specimens off the 

 California coast included two different types of 

 C. tenuicornis Dana that were distinguishable 

 from each other mainly by their size. He created 

 a new species, C. lighti, for the large and elon- 

 gate form. The present collections have no 

 specimen identifiable with C. lighti. 



Calanus plumchrus Marukawa, 1921 

 Occurrence 



Sta. 13. 24 fifth copepodids, 3.93 to 4.41 



mm. 

 Sta. 15. 66 fifth copepodids, 3.84 to 4.03 



mm. 

 Sta. 16. 376 fifth copepodids, 3.84 to 4.32 



mm. 



Remarks 



The specimens of the present collections are 

 identical with the fifth copepodid of Calanus 

 tonsvs Brady described by Campbell (1934), 

 except that they are smaller than Campbell's 

 (4.5-5.0 mm., from the Strait of Georgia) and 

 have 8 setae, instead of 7, on the third endop- 

 odal segment of the third leg. 



Tanaka (1956a), who compared adult speci- 

 mens of C. pliimchrns from the North Pacific 

 with C. to)isus Brady from the Antarctic, re- 

 ported that the two forms are not identical. 



Calanus cristatus Kr0yer, 1848 

 Occurrence 



Sta. 13. 6 fifth copepodids, 6.1 to 6.8 mm 

 Sta. 15. 1 fifth copepodid, 6.1 mm. 



Nannocalanus minor (Claus, 1863) 

 Occurrence 



Sta. 3. 14 adult females, 1.70 to 2.20. 



mm.; 3 adult males, 1.55 to 1.S8 



mm. 

 Sta. 5. 75 adult females, 1.84 to 2.24 



mm.; 10 adult males, 1.65 to 2.01 



mm. 

 Sta. 7. 21 adult females, 1.81 to 2.07 



mm.; 11 adult males, 1.71 to 1.88 



mm. 

 Sta. 9. 15 adult females, 1.84 to 2.04 



mm.; 3 adult males, 1.84 to 1.88 



mm. 

 Sta. 13. 1 adult female, 2.21 mm. 



Remarks 



Sewell (1929) divided females of this spe- 

 cies, mainly by size, into two different forms, 

 namely f. major and f. minor. Later Sewell 

 (1947) also recognized two forms of the male. 

 I was unable to distinguish these forms among 

 the present specimens. 



Neocalanus gracilis (Dana, 1849) 

 (Plate 1, figs. 5-7) 

 Occuri'ence 



Sta. 3. 8 adult females, 3.00 to 3.20 mm. 

 Sta. 5. 30 adult females, 3.16 to 3.46 



mm.; 7 adult males, 2.80 to 2.83 



mm. 

 Sta. 7. 16 adult females, 3.26 to 3.55 



mm.; 5 adult males, 2.73 to 2.93 



mm. 

 Sta. 9. 47 adult females, 3.26 to 3.74 



mm.; 3 adult males, 2.83 to 3.06 



mm. 

 Sta. 13. 6 adult females, 3.45 to 3.64 mm. 



Remarks 



In the male, the first metasomal .segment is 

 separate from the cephalo.some. The distance 

 between a small process on the dorsodistal sur- 

 face of the cephalosome and the articulation 

 between the cephalosome and the first meta- 



532 



U.S. FISH AND WILDLIFE SERVICE 



