RECENT BRITISH OSTRACODA. 



475 



Cyteere emarginata (G. O. Sars). 

 Cytliereis emarginata, G. O. Sars^ loc. cit. ]). 38. 



Scandinavian type. Distribution : Recent — Baffin^s Bay, Norway, Shetland. Fossil — Glacial, Scotland, 

 Norway. 



Shell of the female, seen from the side, subreniform, highest near the middle; greatest 

 height much more than half the length. Anterior extremity rounded, posterior pro- 

 duced below the middle into a prominent angular lobe ; superior margin boldly arched, 

 inferior siuuated in front of the middle and bending upwards l)ehind. Seen from above, 

 the shell is compressed ovate ; extremities broadly mucronate. Right valve very 

 different from the left, higher and more boldly arched, sinuated in front of the eyes ; 

 posterior extremity more dee2)ly emarginate and more prominent below. Shell of the 

 male distinctly quadrangular ; greatest height scarcely exceeding half the length, and 

 situated near the front ; superior margin only slightly armed ; posterior obliquely trun- 

 cate. Surface irregularly sculptured with large angular excavations ; the sculptured 

 portion of the shell terminating abruptly in a transverse ridge, a little in front of the 

 posterior extremity, and below in a sharply cut ventral rib, which is most conspicuous 

 posteriorly. Hinge-line marked on the dorsal aspect by a deep sulcus ; hinge-teeth large 

 and strong. 



Length -3^ in. 



Dredged by Mr. D. Robertson off Shetland. The only British species with wliicli 

 C. emarginata can be confounded is C. angulata, wdiich, however, is considerably smaller 

 and may mostly be distinguished also by the absence of any sharply cut transverse 

 declivity, the prominent tuberculation of the valves, and often by a more or less radiate 

 arrangement of the surface-sculpture. C. costata, Brady, an Arctic species, is a much 

 nearer relative. 



Eucytheue anglica, nov. sp. (Plate XXV. figs. 49, 50.) 



Carapace, seen from the side, subtriangular, highest in the middle, greatest height 

 equal to nearly two-thirds of the length ; anterior extremity broadly rounded, posterior 

 narrowed, obliquely rounded ; superior margin very strongly arched, sloping steej)ly 

 behind, inferior almost straight. Seen from above, the outline is compressed ovate, 

 widest in the middle, tapering to an acute point in front, more obtuse behind, the hinge- 

 line showing a well-defined sulcus behind the middle. Surface of the shell stony in 

 appearance, rudely punctate, and towards the margins showing traces of concentric 

 furrows. 



Length 5V in. 



Hah. Dredged oft' the Durham coast (G. S. B.), arid off the Morecambe Light-ship [Mr. D. Robertson). 



This is referred to, under my description of E. decl 'wis, as a small, roughly punctate 

 form of that species. IlaviDg only met with two specimens in a single locality, I 

 hesitated to admit it as a distinct sjjecies ; but M r. Robertson has recently sent me three 

 specimens, completely identical with it, from the west coast, and I think there can be 

 no longer any doubt respecting the propriety of assigning to them a separate specific 

 name. 



3 s 2 



