16 G. 0. SARS. [SEC. ARC. EXP. FRAM 
Order Copepoda. 
Suborder Calanoida. 
Fam. Calanide. 
66. Calanus finmarchicus (GUNNER.). 
This common species occurred abundantly in plankton-samples from 
many different places. 
67. Calanus hyperboreus, Kroyer. 
Found occasionally together with the preceding species. 
Fam. Eucheetide. 
68. Euchzeta norvegica, Borck. 
Some immature specimens of this form occurred in one of the 
plankton-samples taken on July 10, 1898. 
Fam. Stephide. 
69. Stephos arcticus, G. O. Sars, n. sp. 
(Pl. 1) 
Specific Characters. — Female. Body somewhat more slender 
than in the other known species, with the anterior division oblong oval 
in form, greatest width not attaining half the length. Last pedigerous 
segment not wholly confluent with the preceding one, a slight notch on 
each side indicating the limit between the two; lateral lobes rounded 
off and slightly unequal, the right one somewhat more prominent than 
the left. Urosome slender and narrow, attaining almost half the length 
of the anterior division, genital segment slightly asymmetrical, bulging 
somewhat on left side. Caudal rami about the length of the last seg- 
ment, apical sete rather slender, the innermost but one much the 
longest, and attaining about half the length of the body. Anterior an- 
tennz shorter than the anterior division of the body, and, as in the 
other species, composed of 24 articulations. Posterior antennee, oral 
parts and natatory legs of the structure characteristic of the genus. 
Last pair of legs extremely small, with the distal joint conical in form 
and scarcely denticulated. 
Male somewhat smaller than female and of more slender form, 
with the urosome narrower and 5-articulate, 2nd segment the largest 
