studies oil marine Ostracods 713 



R o d - s h ;i p e d organ: — The shaft reaches to about the third joint of the first 

 antenna or somewhat farther. The capitulum is about as long as or somewhat shorter than the 

 second joint of the first antenna and of about the type reproduced by G. S. Brady and A. M. 

 NORM^^N, 1896; see the appended fig. 3. 



Upper lip: — This is of about the same type as in my fig. 37 of ('. symmetrica; the 

 part between the combs is sometimes, however, notched somewhat deeper at the middle, about 

 the same as in my fig. 4 of C. Belgicae. The paragnates are of about the same type as 

 in my fig. 38 of C. symmetrica. 



Female: — 



Shell: — Length : Of the specimens investigated by me those from Skager Rak meas- 

 ured about 2,5 — 2,7 mm., those from Lofoten about 2,55 — 2,9 mm. and those from the Arctic Ocean 

 2,4 — 2,7 mm. Seen from the side it is of about the same type as in the male, but is 

 somewhat higher posteriorly. Seen from below it is also of about the same type as in the 

 male, but the posterior part is somewhat larger and the side contours evenly curved. The pro- 

 portion between length and breadth is about 2,5 : 1. In other respects it is hke that of the male. 



First antenna: — The division into joints is rather slight. The dorsal bristle on 

 the second joint is about as long as the total length of the two pro.ximal joints of this limb and 

 has short hairs. The e- bristle is about twice as long as this limb, not at all or only very slightly 

 widened and sword-shaped distally; its anterior side is bare. The a-, b-, c- and d-bristles are 

 subequal, about a third of the length of the e-bristle. The first and second joints are partly 

 furnished with short hairs. These joints have yellowish-brown corpuscles. 



Second antenna: — The p r o t o p o d i t e is rather slightly weaker than in 

 the male. E x o p o d i t e: The proportion between the length of this branch and that of the 

 protopodite is about 21 — ^22 : 40. The proportion between the joints of this branch is about 

 the same as in the male. Endopodite: This has two joints; sometimes, however, the little 

 third joint is weakly marked off. The f- and g-bristles are of about the same type and relative 

 size as in the male. The h-, i- and j-bristles, which have no distinctly developed shafts, are 

 either of about the same relative length as in the male or else rather slightly longer. There is 

 an extremely small papilla between the h- and i-bristles. The second endopodite joint is bare. 



Rod-shaped organ: — The shaft reaches somewhat in front of the point of 

 the first antenna; see the appended fig. 12. The capitulum is relatively somewhat shorter than in 

 the male and its shape is about the same as is described and reproduced by V. VA\'R.\, but varies to 

 some extent; see the appended figures 12 — 14. 



Remarks: — It seems to be quite certain that the form dealt with above is identical with Ay/i../.!/"..- 

 C. burealis, G. 0. S.-VRS, 1865. The supplementary description worked out by me is based on 

 material from the type-locality of this species — Lofoten — and this material was defined by 

 G. (). Sars himself as C. borealis. 



Because of thr uncertainty with regard to the relation of tliis species to tiie form ('. 

 maxima established by G. S. Bradv and A. M. Nor.MAN (cf. below) it is impossible at 

 present to give a complete list of synonyms of this species of (I. '). Sars'. 



Zooliii-'. bidrai;, UpiKtila. Supiil.-HU. I. 



