THE MARINE BOTANIST. 127 



stone-crop (Sedtim) ; tlie whole plant^ with the root 

 and stem, when entire, forms a perfect Httle tree in 

 miniature. Lam^encia pinnatifida is exceedingly 

 common on our shores ', the fronds are usually re- 

 gularly pinnate, of a dull purple colour; we are 

 told it is of equally common occurrence in the 

 Pacific and Atlantic basins in both temperate and 

 tropical climates; and that all our Laurenciaceae 

 are also natives of the S, ocean. C. rosea has been 

 lately added to our Flora ; from C. clavellosa it is 

 at once known by the very much greater propor- 

 tional width of the frond : in a specimen which Mrs. 

 Hayden has had the kindness to send me, not more 

 than half an inch in height, the frond is broader 

 than in any variety of C. clavellosa that I am ac- 

 quainted with. Algologists in their excursions 

 should not forget to search for it, and C. reflexa. 



BONNEMAISONIA. 



Named in honour of M. Bonnemaison, a French Naturalist. 



Frond filiform, inarticulate, compressed or plane ; 



solid 'y much branched ; the branches margined 



