segments. The first and second and the eighth 

 and ninth segments are fused, as in the adult 

 female and fifth copepodid female. The anten- 

 nae, masticatory appendages, and the first to 

 fourth pairs of legs are identical with those 

 of the fifth copepodid female. The fifth pair of 

 legs (plate 3, fig. 13) is not fully developed. 

 The left one is 4-segmented ; the third segment 

 carries a small outer spine, and the di.stal seg- 

 ment is tipped with a long seta. The right fifth 

 leg is 3-segmented ; the distal segment is tipped 

 with a long seta and has a small external spine. 



Remarks 



The two forms of E. attemiatus closely re- 

 semble each other in general anatomy but are 

 clearly distinct in size of the body and in seta- 

 tion of the mandibular palp. The total length 

 of the adult female is 4.51 to 4.70 mm. in the 

 small form and 6.52 to 7.00 mm. in the large 

 form. The mandibular palp of the large form 

 has 4 setae on the basis, 2 setae on the first 

 endopodal .segment, and 5 setae on the second ; 

 the palp of the .small form has 2 setae on the 

 basis, no .seta on the fir.st endopodal segment, 

 and 4 setae on the second. 



The biological significance of the morpholog- 

 ical differences shown by the large form cannot 

 be evaluated on the basis of the materials on 

 hand. A. Fleminger (personal communication), 

 however, regards the large forms as ecopheno- 

 typic variants. 



Eucalanus eloncjatus (Dana, 1849) 

 (Plate 3, figs. 14-17) 



Occurrence 



Sta. 3. 10 adult females, 5.95 to 6.40 mm. 

 Sta. 5. 17 adult females, 6.24 to 6.91 



mm. ; 



1 fifth copepodid male, 4.80 mm. 

 Sta. 7. 23 adult females, 6.05 to 7.00 



mm.; 



1 adult male, 4.60 mm. 

 Sta. 13. 9 adult females, 6.14 to 6.72 mm. ; 



1 adult male, 4.70 mm.; 



13 fifth copepodid males, 4.60 to 



4.90 mm. 

 Sta. 15. 3 adult females, 6.30 to 6.70 mm. ; 



4 fifth copepodid males, 4.70 to 



4.80 mm. 



Remarks 



Giesbrecht (1892) described three varieties 

 of E. eJovgatus, namely, hyalimis, inermis, and 

 hungii. Johnson (1938) raised inermis and 

 bungii to the status of species. The specimens 

 li.sted here are identical with hiiaU)nis and are 

 mainly characterized by the pointed postero- 

 lateral corners of the metasome. The mandible 

 has 3 short .setae on the proximal part of the 

 basis and 4 long setae plus 1 short seta on the 

 .second endopodal segment (figs. 14 and 16). 

 The third exopodal .segment of the first leg has 

 1 external spine (figs. 15 and 17). 



Eucalanvs bvngii Giesbrecht, 1892 

 (Plate 4, figs. 1-3) 

 Occurrence 



E. bungii bioigii Johnson, 1938 



Sta. 16. 19 adult females, 5.51 to 6.08 

 mm. ; 



3 fifth copepodid females, 4.27 

 to 4.75 mm.; 



4 fifth copepodid males, 4.27 to 

 4.56 mm. 



E. bvngii calif ovjiicns Johnson, 1938 

 Sta. 5. 1 fifth copepodid female, 4.22 

 mm. ; 



1 fifth copepodid male, 4.12 

 mm. 



Sta. 7. 4 adult females, 5.66 to 5.95 



mm. ; 



3 fifth copepodid females, 4.22 



to 4.51 mm. ; 



6 fifth copepodid males, 4.12 to 



4.51 mm. 

 Sta. 13. 7 adult females, 5.70 to 6.40 



mm. ; 



20 fifth copepodid females, 4.30 



to 4.80 mm. ; 



22 fifth copepodid males, 4.00 



to 4.30 mm. 

 Sta. 15. 20 adult females, 5.28 to 6.40 



mm. ; 



2 fifth copepodid males, 4.20 to 

 4.40 mm. 



Sta. 16. 4 adult female.s, 5.70 to 6.27 

 mm. 



Remarks 



Encalanns bungii can be easily distinguished 

 from E. elongatifs by the rounded postero- 



538 



U.S. FISH AND WILDLIFE SERVICE 



