44 



COPEPODA 



of legs and the corresponding Se is distinctly smaller than the following. The fifth pair of legs 

 has the Ri II— III fused with the usual number of setae, as well as the Re II— III, bearing 3 Se (pore 

 at base of Se I missingl and 5 Si. 



Y. (IV). Size: 6-8 mm. (anterior portion 5-5; posterior 1-3). The body differs distinctly by a three- 

 segmented abdomen; the first somite, which is slightly produced beneath, is the shortest, and i-6 shorter 

 than the third one. The antcnnulae, especially the distal segments, are comparatively longer; the 

 number of setae differ in several details. The vtaxillnlae differ by a smaller number of bristles in 

 Ri (Ri I has f. inst. only 2 setae) and by 9 setae of Re. The first pair of legs have the Ri II —III 

 fused with 8 setae, and the Re II — III with 3 rather slender Se, but only 4 Si. The second pair of 

 legs has the Ri II — III fused with 9 setae, and the Re II — III fused with 3 Se and 5 Si; glandular 

 pores as in preceding stage. The fourth pair of legs has 7 setae in Ri II ess III, and 5 Si and 3 Se, 

 of which first one without glandular pore, in Re II ^ III. The fifth pair of legs has the Ri I ^ III 

 with 6 setae and the Re Ic^^III with 3 Si, 3 Se and a St.; only a .single pore at base of Se III 

 is found. 



Occurrence. This species has not been captured by the lugolf Expedition, but has been taken 

 at the following stations in deep hauls by the Thor 1904 — 1905 south and west of Iceland. 



Thor '9/6 1904 St. 152 65°oo Lat. N. 28°oo Long. W. ly (IV). 



■3/7 1903 St. 164 62°io Lat N. i9°36 Long. W. if?. 



■% 1904 St. 180 6i°34 LaL N. t9°o5 Long. W. Yt 1800 M. W. 2 f?; 3 fc?; ly (V). 



"/; 1904 St. 183 6i°30 Lat N. i7°o8 Long. W. Yt. 1800 M. W. 4 f?; 4 fj*; 5y (V); i y (IV). 



24/5 1904 St. 104 62°47 LaL N. i5°03 Long. W. Yt 1500 M. W. ly? (V). 

 ■^5 1904 St 78 6i°o8 Lat N. 9°28 Long. W. if?. 



*9/8 1905 St 167 6o°oo Lat N. io°35 Long. W. Yt 1000 M. W. i f?. 



31/8 1905 St 167 57°46 Lat N. 9=55 Long. W. Yt 1500 M. W. i f?; i y (V); i y (IV). 



8/6 1905 St 72 57°52 Lat N. 9°53 Long. W. Yt 1500 M. W. i f?; i y (IV). 



23/7 1905 St 124 6i°04 Lat N. 4=33 Long. W. Yt. 1000 M. W. if?. 



Distribution. This species seems to be fairly common in the Fseroe-Shetland Channel, and on 

 the west coast of Ireland between 600 and 1000 fathoms. It has been taken in the Atlantic by the 

 Gauss Expedition as well as at a single station in the south polar region (c. 65° Lat S. c. 85° Long. E). 

 By the Siboga Expedition it has been taken at three stations at about 4° Lat S. 129 Long. E. 



Eucalanidae. 



Rhincalanus nasutus Giesbr. 

 (PI. I figs. 4a— e). 



1877, Rhincalanus gigas Brady. Mobius. 

 18SS. — nasutus n. sp. Giesbrecht, p. 534. 



18S8. — gigas Brady. J. C. Thompson, p. 14S. 



[892. — nasutus Giesbr. Giesbrecht, pp. 152 — 158, 



taf. 3, 12 and 35. 



1898. Rhincalanus nasutus Giesbr. Giesbrecht & Schnieil pp. 



22-23. 

 1901. — gigas Brady Th. Scott, p. 237; pi. XXVII 



figs. 1—4. 



