EXPLANATION OF PLATE IV 



(All figures magnified 29 diameters) 



Figure 1. — Pontocypris subreniformis, G. S. Brady. A right valve. 

 Figure 2. — Cythere foveolata, G. S. Brady. A right valve. 

 Figure 3. — Cythere parallelogramma, G. S. Brady. A left valve. 

 Figure 4. — Cytheropteron antarcticum, sp. n. Right valve. 

 Figure 5. — Cytherideis Icevata, G. S. Brady. A right valve. 



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