436 MR. F. CHAPMAN ON DEEP-SEA FORAMINIFERA 



Xestoleberis acuminalts, Chapman. 



Xestoleheris acuminalis, Chapman ('02^), p. 429, pi. 37. figs. 4«-c. 



Previously found in dredgings from the lagoon at Funafuti. 

 Occurrence. — Sta. 13, 1050 fms. ; one vah^e. 



Genus Cytherura, G. 0. Sars. 



Cytherura tenuicosta, sp. nov. (Plate 57. figs. 24 a, b.) 



Description. — Carapace elongate, narrow-ovate, compressed ; seen from the 

 side, ventral and dorsal margins nearly parallel ; dorsal margin with a gentle 

 median sinuosity and excavated posteriorly ; middle of dorsal margin straight 

 and curving towards both extremities to meet the evenly rounded anterior 

 border and the rather sharply pointed posterior prolongation. Carapace 

 thickest towards the ventral border, the surface sloping convexly to the ventral, 

 and with a transverse median depression ; surface-ornament consisting of about 

 seven fine, sharp, parallel, longitudinal costse, which become confluent at the 

 extremities of the valve ; the interspaces crossed by faint strise. 



Length •625 mm. ; height '23 mm. ; approximate thickness of carapace 

 •21 ram. 



AJinities. — In general shape, although more elongate, this species resembles 

 Cytliemra clavata, G. S. Brady *. The ornament of the valve-surface in that 

 species, however, consists of numerous, delicate, anastomosing ridges, whilst 

 in the present species they are parallel and extend nearly the whole length 

 of the valve. 



Occurrence. — Sta. 11, 1417 fms. ; 20, 1215 fms. 



Genus Cytheropteron, G. 0. Sars. 

 Cytheropteron wellingtoniense, G. S. Brady. 



Cytheropteron wellingtoniense, G. S. Brady ('80), p. 36, pi. 34. figs. 4 a-d. 



Previously described from Wellington Harbour^ New Zealand. The 

 anterior margin in our example is more evenly rounded than in the figure 

 given by Brady. 



Occurrence. — Sta. 13, 1050 fms. 



Cytheropteron assimile, G. S. Brady, var. funafutiensis, nov. 

 (Plate 57. fig. 25.) 



Uef. to type form : G. S. Brady ('80), p. 138, pi. 34. figs. 3 a-d. 



The tjrpe species was recorded from Kerguelen Island, 120 fathoms, and 

 off Heard Island, 75 fathoms. 



* G. S. Brady ('80), p. 133, pi. 29. figs. 7 a-d. 



