EXPLANATION To I'LATK XX. 



Fie;. 1. Si-i-liilin-i /In iiiii/ilin riji'ni Allnian. Part of brancli (enlarged). 



2. Ni-i-liilni-i-llii inii/iliorij'i-i'ii. Knd nf hydrotheea (greatly enlarged) . 



:!. Sci-litliii'i'llu Jiixij'iii-ntis Ilincks (cnlarfjt'd). (After Hincks. ) 



4. ,s'i rlii/iii-i /In fiixijunnix. (innaiigiuin (enlarged). (After Ilincks. ) 



'. Hi'i-tnlitivllit jiii-lit (Mi-yen). Part nf colnny (enlar<;ed). ( After Meyen.) 



6. Sertularella picta. Single hydrotheca (greatly enlarged) . (After Hart lauli. ) 



7. Serlularella picta. Partof branch \vitligipnaiifjiinn (enlarged). ( After Ilartlaiih. ) 

 s. Serltdarella megastoma Nutting. Part of branch (enlarged). 



9. Sertularella nmjnxloma. Part nf lirancli \vitli fionangiuin (enlarged). 

 II), II. Si-rliilnn-llii .inlitiiriii XnttiiiLT. Single hydriitlii-c.'i' (enlargeil). 



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