EXPLANATION TO PI.ATK XXI. 



. 1. Agloopluinio iiihntttt Fewkes. I ! ydrotheea (greatly enlarged). 



1'. Aglaophenia minnttt. Kase of hydroeladiiini, showing the proeesseH (enlarged). 



'>. Aglaophenia niinn/n. Corbula (enlarged). 



1. Aglaophenia gerpiiailla Allinan. Part ( hydrocladium i ciihu'^i'd i. (Al'tcr Allinan.) 



.". Aglaophenia perpusilla. Siile view of stem, showing prorrsses al liast-H nf liyilroc-l/nlia (rnlargi'il). (Alter 



Allman.) 



). AfflaoplicniQ mefnimillata Nulling. I'art d' liydroi'ladiiini (enlarged). 



7. Aijlaoplien'm inaiiiiiiilliilu. 1I\ ilmtheca (greatly enlarged). 



S. .li/liitijiln'iiiii iitniniinUntii. I'ront view <if liydrotliec.i- -nlargi.-il I. 



!i. Aglaophenia mammillata. Front view <it' stem (enlarged). 



10. Aglaophenia iitaiinnillatu. Side view id' *tem, showing prooesses (enlarged i. 



11. Aijluuphfniit minima Nutting. Hydrntlieca .greatly enlarge<l). 

 11'. Aglaophenia minimn. Coilnil:i (enlarged'. 



l'.\. Aglaoplienia mininm. Side view of stem, showing processes i en'iirged), 

 II. Aglaopheuia perforate! Allinaii. Part of hydroclailium (enlarged . M'ler Allinan.) 

 l."i. Aglaoplienia perforatu. (.'orhula i enlarged). (After Allinan. i 

 224 



