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ANALYSIS OF THE GENERA. 



Tubercles conspicuous. 



Disk and tentacles retractile. 

 Tubercles of one kind only. 



In the form of rounded warts. 



Irregularly scattered Tealia. 



Arranged in vertical lines .... Bunodes. 

 Arranged in many horizontal lines 



{Not British) " A.fusco-rubra. 



Arranged in a single horizontal line . Hormathia. 

 In the form of pointed blisters (Not British) Cystactis. 

 Tubercles of two kinds, viz. rounded warts and 



erectile pointed papillae (Not Brttish) . . Echinactis. 



Disk and tentacles not retractile Bolocera. 



Tubercles obsolete Stomphia. 



