146 BRITISH SEA-WEEDS. \_Melanosj)eTme(e . 



the shore in great abundance near Brodick in the island 

 of Arran ; it was narrow and dark-coloured, and I at first 

 mistook it for Torjjhjra linearis in an old state, wondering 

 that it should be found so late in the season : as on the 

 opposite coast of Ayrshire it disappears very early. The 

 fronds in this instance were very much attenuated at the 

 base. The dots of fructification, instead of being round, as 

 in the preceding species, are in this oblong and longer. 

 There is a fine figure of it with magnified fruit, &c., in Alg. 

 Brit., PL IX. fig. 2. AYhen this species is fresh gathered 

 it has the perfume of cucumbers so strongly as to fill a 

 room with its fragrance, when the vasculum is opened. 

 Perhaps the other species have the same perfume, but we 

 have not observed it. 



3. PuNCTARiA TENUissiMA, GrevHU. 



Ilab. In the sea, parasitic on Zostera marina. Annual. 

 Summer. Pound by Captain Carmichael at Appin ; Dr. 

 Greville, in Bute. AVhen in a row-boat off Little Cumbrae 

 we have seen it growing abundantly on Zostera marina. It 

 is often got on Zostera marina by Major j\Iartin at Ardrossan. 

 We obtained it in June 1850, in great abundance, among 

 the drift on the shore, between Largs and Pairlie, attached 

 to Zostera. Mrs. Griffiths thinks that it is the young of 

 Punctaria latifoUa. 



