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'XL Cakndarium Planiarum marinarum. By Tiawfon 'Turner^ Efq, F.L.S. 



E.iad March 5, 1799. 



IN fubmitting to the'Lmneah Society a lift of the periods at Which 

 fome of the Britilh marine Alga: produce their fruftification, it 

 may not perhaps he wholly unnecefTary to preface it by obferving, 

 that the habitation of many of thefe plants at the bottom of the 

 ocean, remote from any (hore, where we are of necefTity precluded 

 from all poffibility of tracing them through their fe'veral ftages of 

 growth, is certainly one of the greateft obftacles to our procuring a 

 clear and comprehenfive kno .vledge of them. How far the difficul- 

 'ties arifing from this circumftancc can ever be entirely i-emoved, 

 time and experience muft alone determine ; but we have reafon to 

 entertain very fanguine hopes, as the beauty of this tribe has of late 

 years attra6ted many admirers, to whofe zeal and abilities marine 

 botany is much indebted ; and this Society may boaft of having 

 given to the world by far the moft valuable account ever written of 

 thefe plants. But much ftill remains to be done ; and it can be done 

 only by naturalifts refident upon the different parts of the coaft ac- 

 cuftoming themfelves to examine attentively the various fpecies in 

 their feveral gradations, and laying before the world the refult of 

 their inquiries. To ftimulate them to this, was one of my principal 

 objefts in bringing forward the prefent remarks; for, as no Britifli 

 author has given us any thing like a complete lift of the times of 

 fructification of the fubmerfed Jlga, thofe naturalifts who are in 



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