EXPLANATION OF PLATE 



Peronosporites ramosus sp. nov. 

 Fig. 



1 A transverse section of a punctate brachiopod shell inhabited 



by P. ramosus. a^=shell punctae. xl50 



2 Branch & of fig. 1. x625 



3 A shell cut parallel to the surface, showing an advanced stage 



of disintegration caused by P. ramosus 



Peronosporites globosus sp. nov. 



4 An impunctate brachiopod shell inhabited by P. g 1 o b o s u s. 



x250 



Peronosporites minutus sp. nov. 



5 An impunctate brachiopod shell penetrated on one side only 



by P. minutus. xl25 



(f a, a spherical swelling on a hypha, x500 ; 6, a hypha. x500 



