Illustrations in British %adogy ; 



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 fhki $• pinnata Lamar c^\ ^&ffosi*^je sn ftf#cjt, .jplufeerlita 

 pinnate; pinnae alternate, slightly arched, three originating 

 from each joint of the stem ; cells unilateral, uniserial, rather 

 distant, campanulate, leaning ; the mouth wide and entire. 



2. PI. selacea Lamarck, Stem simple, slightly waved, 

 plume-like, pinnate; pinnae alternate, arched, one originating 

 at each ringed joint 5 cells very, remote, campanulate, with an 

 even margin ; vesicles elliptical, axillary. , L t Jian9q ssoriw at 



3. PL Cathar.lna Johnston, Stein simple, erect, plume- 

 like, pinnate; pinnae opposite, erecto-patent, bent inwards; 

 cells uniserial, distant, campanulate, with an even margin, 

 and intervening tooth-like cells; vesicles solitary, scattered, 

 pear-shaped, stalked. (Jig* 62.) ,( d'Sulwbua 



Plumularia Catharine grows in deep water, attached to 

 old shells, gravel, &c. ; or, as in the present instance, to the 



