Spkarocoecoklece.'] rhodymenia. 245 



4. Ehodymenia cmsTATA, Greville, 



Hab. Parasitical on the stems of Laminaria digit ata. A 

 northern species. Yery rare. Annual. July. Eound by 

 Sir W. J. Hooker and Mr. Borrer at Wick in Caithness ; 

 in the Prith of Forth, Dr. Greville ; at Berwick, Dr. John- 

 ston. I have lately been much gratified by receiving from 

 Professor W. H. Harvey, American specimens of tliis rare 

 British plant. It varies a good deal in form. Some 

 varieties of it are like small specimens of Splmrococcus coro- 

 nojnfoliiis. 



5. Ehodymenia ciliata, Greville, 



Hab. On rocks in deep water. Annual. Winter. Pre- 

 quent on the southern shores of England, and in some 

 places in Ireland. Rare in Scotland, where it was found 

 I)y Lightfoot in lona ; and by Lieut. Thomas and Dr. 

 M^Bain, in Orkney. 



Substance thicker than any other 'Rliodymenia ; colour, 

 a deep red. I have a fine specimen from Miss White, 

 Jersey. It has lately been dredged off Cumbraes by Major 

 Martin, and off Arran by D. L. 



6. Rhody^ienia jubata, Greville. (Plate XL fig. 43 

 frond, natural size, and a magnified figure of a cilium with 

 a tubercle.) 



