NO. 5.] ACCOUNT OF THE SPECIES. 127 



OSTRACODA. 



Tribe: MYODOCOPA. 



Fam. conchceciidjE. 



Gen, Conchcecia, Dana. 



Remarks. This genus was established in the year 1853 by Dana, to 

 include 2 peculiar pelagic Ostracoda from the tropical parts of the oceans, 

 and some years afterwards a 3rd species from the Atlantic Ocean was added 

 by Lubbock, though referred by him to the nearly-allied genus Halocypris. 

 The first statement of the occurrence of this genus also in the northern 

 oceans, was made by the present author, who, in the year 1865, recorded 3 

 Norwegian species, 2 of which were taken from great depths off the Lofoten 

 Islands. In recent times, a number of additional species have been described 

 from different parts of the oceans, and among them is a form recorded by 

 Messrs. Brady and Norman, which seems to be peculiar to the Arctic Ocean, 

 and which also occurred very abundantly in the samples brought home from 

 the Nansen Expedition. As only a very short description, accompanied by 

 some few figures, has been given by Messrs. Brady and Norman, I propose 

 in the following pages to describe this beautiful and large-sized form more in 

 detail, giving figures, on the last 2 plates, of both sexes, with anatomical 

 analyses of each. 



Conchcecia maxima, Brady & Norman. 

 (PI. XXXV & XXXVI). 



Conchcecia maxima, Brady & Norman, A Monograph of the marine and 

 fresh-water Ostracoda of the North Atlantic and North-western Europe, 

 Part II. Transact. Roy. Dublin Society, Vol. V, p. 686, PI. LXI, figs. 



1—8. 



Specific Characters. Shell of female moderately tumid, seen laterally, 

 oblong oval in form, somewhat widening behind, greatest height not quite 

 equalling half the length, rostral prominence well defined and very slightly 

 deflexed, subrostral notch rather deep, anterior extremity below the latter 

 narrowly rounded, posterior obtusely truncated, ventral margin very slightly 



