l^:^ G. 0. SARS. CRUSTACEA. [norw. pol. exp. 



slightly emarginated behind, and has the lateral corners scarcely at all 

 produced. The last segment, as in other Cyclopoida, is very movably 

 connected with the preceding one, and much narrower, being scarcely broader 

 than the caudal segments. It is quite simple, subcylindric in form, and does 

 not exhibit the slightest trace of any limbs. 



The tail proper is about half the length of the anterior division, and is 

 composed of only 3 segments, besides the caudal rami. The 1st or genital 

 segment, as usual, is the largest, equalling in length the other 2 combined; 

 and it is but very slightly dilated in its anterior part, with the ventral 

 face a little protuberant, exhibiting the genital orifices on each side. How 

 the ova are carried is still unknown, as no ovigerous specimens have as yet 

 been met with. It is not improbable, that they are congregated within a 

 single ovisac, which in this instance may be ventral, as in the Calanoids. 

 The last, or anal segment is considerably larger than the middle one, and 

 is transversely truncated at the end. The caudal rami (see fig. 12) are exceed- 

 ingly slender and elongated, equalling in length the remaining part of the 

 tail and the last segment of the trunk combined. They are narrow linear in 

 form, and slightly divergent, with the inner edge finely ciliated throughout. 

 The outer edge, on the other hand, is ciliated for a very short distance 

 proximally, and has, at about the end of the first 5th part, a distinct ledge, 

 to which a very slender seta is attached, extending behind almost to the tip 

 of the ramus. The latter is transversely truncated, and carries 5 setae, the 

 outermost and innermost of which are very small, hair-like. The other 3, 

 like the lateral seta, are distinctly ciliated, and of i-ather unequal length, the 

 middle one being much the longest, and fully twice the length of the ramus. 

 Of the other 2, the inner one is 3 times as long as the outer. A very 

 delicate and slender bristle is also attached to each ramus close to the tip 

 dorsally. 



As in the other 2 species, no trace of eyes is found. 



The anterior antennae (see figs. 1 & 2) are slender and elongated, 

 reaching, when reflexed (see fig. 2), somewhat beyond the genital segment. 

 In .spite of their great length, they are found to be composed of a very 

 limited number of joints, only 3 of them being distinctly defined. Of these the 

 1st is somewhat longer than the other 2 combined, the latter being of about 

 equal length. All the joints carry scattered setae of unequal size, some of 



