SphcerococcoiflecB.'] RHODYiiENiA. 243 



1. Rhodymenia bifida, GreviUe. 



Hab. Ou rocks in the sea, and on Algse. Summer. 

 Annual. Erequeut on the southern shores of England. 

 In Ireland, where it is not rare, fine broad-fronded speci- 

 mens have been got by Miss Hyndman and Mr. D. Moore. 

 Jt has been got by Dr. Greville in Bute. Not uncommon 

 on the coast of Ayrshire, where it has been often found by 

 Major Martin and by D. L. It is most abundant in early 

 autumn, when it is cast out in the form*of round tufted 

 balls, frequently the abode of the pretty zoophyte, Valkeria 

 cuscuta. 



A curious variety of this plant was gathered by my kind 

 friend Mr. Keddie, respecting which Professor Harvey said 

 that it was so different from the usual appearance, that had 

 it come from a distant country he should have been disposed 

 to exalt it into a species, under the name of R.fimbriata. 

 It is, however, a very variable plant everywhere. It is as 

 thin as a Nitophyllum in fruit, but it differs from Nito- 

 phjllum and even from other R]io(lijmeni(B. 



2. Ehodymenia laciniata, Greville. (Plate IX. fig. 36, 

 plant of the natural size, with a small portion of the margin 

 with imbedded tubercles or coccidia, magnified.) 



Hab. On rocks, and on Laminarm ; generally in deep 



