DB. DICKIE OS AECTIC SPECIES OF ALOiE. 237 



Lamtxariace^. 



Aganim Ttirncri^ P. & E. Tin's remarkable plant is In great 

 abundance, and marks the npper limit of the Laminarian zone, 

 taking the place which X. digitata occupies on British shores. 

 A suite of specimens at different periods shows that the frond is 

 in the earlier stages broadly linear, then linear-lanceolate, next 

 cordate-lanceolate, and finally cordate and cordate-ovate. The 

 midrib is obvious at a very early stage, even when the plant is 

 but half an inch long ; the holes appear at a later period : I 

 possess specimens four inches in length, M^hich have nearly 

 assumed the outline of the mature frond, and yet no trace of 

 holes. 



Laminaria longicriirisy De la Pyl. This remarkable species is 

 in great profusion. Mr. Taylor reports having seen specimens 

 in the sound which measured npwards of 80 feet, stem and frond 

 together. 



L, saccJiarina, Lam. Not so plentiful as the last. 



L, fascia, Ag. All the specimens are of the narrow variety, 

 6 to 12 inches long, and a quarter of an inch in breadth. 



DlCTYOTACE^. 



Dicti/osipTionfoeniciclaceiiSjGrQX. Seems to be not uncommon, 



but very small. 



Chorda lomentaria, GrcA'. Trom 4 to G inches in length, 



I^itnctaria plantaginea^ Grev. Is probably rare; only a single 

 specimen procured, length 4 inches. 



CnoiinARiACE^. 



ChordariaflageUiformis, Ag. Not uncommon ; small, branches 

 fine and distant. 



Salfsia dettsta, C. Ag. Adhering to rocks and stones. 



A curious variety of this species forms a thin dark-olive crust 

 on the terminal spires of littoral ^lollusca {Buccimim, Littorina, 

 and on Lottia ; the movements of the animals and consequent 

 friction to which the plant is exposed prevent its full develop- 

 ment. 



EJachisla fucicola^ Pries. Paraoitical on Climlomorjpia, Mela* 

 gonium and Desmarestia acidcata. I can find no essential differ- 

 ence between the specimens from Cumberland Sound and British 

 81>ecimens, the former being merely smaller. 



