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 380 (pore 

 at base of Se I missing) 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 1-6 shorter 

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

 number of setae differ in several details. The maxillulae 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<N>III, and 5 Si and 3 Se, 

 of which first one without glandular pore, in Re II <v> III. The fifth pair of legs has the Ri Io->III 

 with 6 setae and the Re I com 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 Ingolf Expedition, but has been taken 

 at the following stations in deep hauls by the Thor 19041905 south and west of Iceland. 



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



J s/ 7 1903 St. 164 62io Lat N. i936 Long. W. i ?. 



'% 1904 St 180 6i34 Lat. N. T9O5 Long. W. Yt 1800 M. W. 2 f?; 3 fo*; iy (V). 



/ 7 1904 St 183 6i30 Lat N. i;o8 Long. W. Yt. 1800 M. W. 4 f ?; 4 fc?; 5y (V); i y (IV). 



2 V 5 1904 St 104 6247 Lat N. I5O3 Long. W. Yt 1500 M. W. iy? (V). 



I2 / 5 1904 St. 78 6io8 Lat N. 928 Long. W. i f ?. 



2 9/ 8 1905 St 167 6ooo Lat N. io35 Long. W. Yt 1000 M. W. i f?. 



3'/8 1905 St. 167 57=46 Lat N. g55 Long. W. Yt 1500 M. W. if?; i y (V); i y (IV). 



% 1905 St. 72 5752 Lat N. 953 Long. W. Yt 1500 M. W. i f?; i y (IV). 



2 3/ ? 1905 St 124 6i04 Lat N. 433 Long. W. Yt. 1000 M. W. i f ?. 



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. 4 a e). 



1877. Rhincalanus gigas Brady. Mobius. 

 1888. nasutus n. sp. Giesbrecht, p. 334. 



1888. gigas Brady. J. C. Thompson, p. 148. 



1892. nasutus Giesbr. Giesbrecht, pp. 152 158, 



taf. 3, 12 and 35. 



1898. Rhincalanus nasutus Giesbr. Giesbrecht & Schmeil pp. 



22 23. 



1901. gigs Brady Th. Scott, p. 237; pi. XXVII 



figs. 14. 



