230 



MR. F. CHAPMAN ON FORAMINIFERA AND [Mar. 18, 



Oytherella vesiculosa, sp. nov. (Text-fig. 28.) 



Carapace subrectangular, elongate, seen from the side. Surface 



of carapace highest near the dorsal margin, sloping towards the 



ventral, with a depressed area in the middle of the valve near the 



ventral margin, in the lowest part of which there is a circular pit. 



Text-fi^, 



Cytherella vesiculosa. 

 a, right valve, lateral view ; b, edge view ; c, end view. 



X 42 linear. 



Anterior part of carapace gently sloping towards the margin ; 

 posterior border steep. Edge view cuneate. End view oval. 

 Surface of valves ornamented with numerous deeply-set pittings 

 or cavities. Length "76 mm. 



Cocos Island, lagoon ; rare. 



The nearest form to this handsome species seems to be C. semi- 

 icdis G. S. Brady ; but it differs in having only a part of the 

 carapace covered with pittings, which are not, however, exactly 

 comparable with those in our form, and the carapace itself is 

 also shorter and stouter. The ventero-median pit is also wanting 

 in C. semitalis, 



Ostracoda from Cocos Island. 



f., freqi^ent ; c, common: v.c, very common: r., rare; v.r., very r.ire. 



