456 Proceedings of the Royal Irish Academy. 



L. hieroglyphica, J. Ag. 12 N. 



Foslie regards tMs as a variety of L. saccharina (Lamx.), 

 diifering from it in the marginal ornamentation of the lamina. 



L. digitata, Edm. 10-14. (The common oar -weed). 



/. stenophylla^ Harv. 10. 12. 

 L. hyperlorea (Gunn), Fosl. 11. 12. 

 /. typica, Fosl. 



This variety is distinguished by Foslie, its founder, from 

 Z. digitata, Edm., as follows : — Its base is broad, and the 

 young frond does not split up before the old one falls away. 

 The stem or stalk is rounder, and nearly all the tips of the new 

 lamina are fastened to the old one. 



Saccorhiza, De la Pyl. 



S. hdbosa, De la Pyl. 



On all the coasts at very low water. 



Alaria, Grev. 



A. esculenta, Grev. 10-14. 



Cohort III. — Spoeochxin^. 



Order. — Spoeochnace^. 

 Sporoclinus, C. Ag. 



S. pedunculatus, C. Ag. 



On all the coasts, extra-tidal. 



Carpomitra, Kiitz. 



C. Cah-erm, ^utz. 11. 14. (Miss Ball.) 



Cohort lY. — CutleeijST^. 



Order. — Cutlekiaceje. 

 Aglaozonia, Zan. 



A. reptans, Kiitz. = A. parvula, Grev. 



On all the coasts, extra-tidal. "We have abundantly con- 

 firmed Harvey's prophecy that dredging would reveal this 

 species at all points of the Irish coast. 



Cutleria, Grev. 



C. multijida, Grey. 10- J 4. Extra-tidal. 



