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developed, they form such a striking featui-e in its character, that 

 there can be no mistaking it. The banded articulations too are quite 

 peculiar. 



It should be carefully looked for in tide-pools, as it is likely to occur 

 in many more places than those in which it has yet been found, and 

 besides, it is very probable that there may be other species in this 

 obscure family still to reward the labour of the attentive explorer, as 

 the history of the family is still very imperfect, and only a few leading 

 facts are known of their history. 



SPHACELARIA FUSCA. 



EXPLANATION OF DISSECTIONS, &c. 



Fig. 1. — Sphacelaria fusca, tuft, natural size. 

 2. — Branch. 



3. — Hamulus. Both magnified. 

 (Reduced from Pkyc. Brit. ) 



