O'CONNELL, REVISIO^' OF THE GENUS ZAPHRENTIS 191 



VIII. Heliophrentis Grabau. Silurian tu Devonian. 



Genotype: 11. alternata Grabau. Other example, Zaphren- 

 tis racinensis Whitfield (may be true Zaphrentis). 

 IX. Siphonophrentis O'Connell. Devonian. 



Genotype: C aryophy Ilia gigan tea hesueur (Zaphrentis gig an- 

 tea of most authors). 



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