EXPLANATION OF PLATE III. 



(All figures on this plate magnified 52 diameters.) 



Fig. 1. Cytheropteron abyssorum, G. S. Brady, var. ivilesensis, 

 var. nov. a, left valve ; b, outline of edge view. 

 Forty miles south of Cape Wiles, S.A., 100 fathoms. 



Fig. 2. Cytheropteron dannevigi, sp. nov. a, left valve ; b, 

 outline of edge view ; c, outline of end view. Sta- 

 tion 36, east of Tasmania, 777 fathoms. 



Fig. 3. Cytheropteron fimbriatum, sp. nov. a, left valve ; 

 6, outline of edge view. Station 36, east of Tas- 

 mania, 777 fathoms. 



Fig. 4. Bythocythere velifera, G. S. Brady, a, left valve ; b, 

 outline of edge view. Forty miles south of Cape 

 Wiles, S.A., 100 fathoms. 



