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or less completely, ol' no less Hum .">.') dill'ercul 1'onns ol' Kchinoderms, 

 I lie developmenl ol' which \v;is lotally unknown lill now. The presenl 

 contribution accordingly represents ;i very considerable ;iddilion to our 

 knowledge of the developmenl and the larval forms of Kchinoderms and 

 - combined with our previous knowledge forms a reasonable founda- 

 tion for a discussion of the problem that was the main object of these 

 researches: the interrelation between the larvtv and the adults in regard 

 to a natural classification. Also the comparative study of pelagic larva- 

 of unknown parentage, especially of the Ophiurid larva?, yields valuable 

 support for the conclusions to be drawn. Of course, very much more 

 needs to be done. The investigations here recorded may only be regarded 

 as an introduction. Still, enough is done already to give us a glimpse 

 of the end; it is evident that the way here entered upon is the right way, 

 which will lead to the desired results. I hope to be able in the future 

 to carry these researches further towards a definite solution of the problem. 



