AND OSTRACODA COLLECTED ROUND FUNAFUTI. 433 



This species is distinct from C. dictyon, which it most resembles^ in having 

 a rounded ridge-swelling on the ventral margin, instead of a sharp, angulated 

 ridge, as well as in the finer sculpturing o£ the valve- surface. 



This species is named in honour of my friend Mr. G. Sweet, who so ably 

 assisted Professor David in the work of boring in the Funafuti Atoll. 



Occurrence.— ^i?i. 10, 1485 fms. ; 11, 1417 fms. ; 13, 1050 fms. ; 20, 

 1215 fms. 



Cythere viminea, G. S. Brady. 



Cythere viminea, G. S. Brady ('80), p. 94, pi. 18. figs. 3 a-e. 



A right valve occurs in the present collection, which agrees with Brady's 

 species in almost all essential characters, but is slightly larger, and the surface- 

 sculpturing of polygonal fossse is rather more minute. 



The ' Challenger ' specimen was found at a depth of 1375 fathoms in the 

 Southern Ocean. 



Occurrence. — Sta. 10, 1485 fms. 



Cythere dictyon, G. S. Brady. 



Cythere dictyon, G. S. Brady ('80), p. 99, pi. 24. figs. 1 a-y ; Egger ('01), p. 442, pi. 6. 

 figs, 41-43. 



This is one of the most widely distributed of the deep-sea Ostracoda. The 

 ' Challenger ' specimens were found mainly between 1000 and 2000 fathoms 

 the least depth recorded being 120 fathoms. The sculpture on the valves of 

 a few of the Funafuti examples is much finer and neater than in typical 

 specimens, and the anterior rim is more strongly defined. 



Occurrence.— Sta. 10, 1485 fms. ; 11, 1417 fms. ; 13, 1050 fms. ; 20, 

 1215 fms. ; 45, 2107 fms. ; 105, 2400 fms. 



Cythere velivola, G. S. Brady. 



Cythere velivola, G. S. Brady ('80), p. Ill, pi. 23. figs. 4 a-c. 



This peculiarly ornamented little species was found in the ' Challenger ' 

 dredgings from S.W. of New Guinea, 28 fathoms. 



The only example found in the present series is a right valve, which differs 

 from the figured specimens of Dr. Brady's in its sharply pointed posterior 

 extremity. 



Occurrence. — Sta. 10, 1485 fms. 



(?) Cythere serratula, G. S. Brady. 



(?) Cythere serratula, G. S. Brady ('80), p. 77, pi, 43. figs. 7 a-d. 



Previously recorded off Culebra Isl., West Indies, 390 fathoms; off 

 Canaries, 1125 fathoms ; and N. of Tristan d'Acunha, 1425 fms. 

 Occurrence. — Sta. 13, 1050 fms. 



