Marine Algoz of Berwick-on-Tweed. 251 



Enteromorpha ralfsii, Harv. 

 Phyc. Brit. pi. 282. 

 Descr. etFig. Enteromorpha Ralfsii, Harv., I.e. 



Exsicc. ,, „ Le Jol., Alg. Mar. Cherb., no. 230. 



Syn. „ „ J. Ag., Till. Alg. Syst. vi., p. 149. 



Ulva Ralfsii, Le Jul., Liste., p. 54. 

 Hab. On the sand and mud at half-tide level. Aug. — Dec. Rare. 



Fenham Flats ; Holy Island. 

 A rare species, usually found mixed with other Enteromorpha, 

 and Conferva. It forms yellowish-green layers over mud and 

 muddy sand between tide-marks. The filaments are very slender 

 and nearly simple, and like Enteromorpha percursa usually 

 composed of but two rows of cells, although filaments composed 

 of four rows are not uncommon. 



Enteromorpha percursa {Ag.) Hook. 



Br. Fl. ii., p. 315. — Ulva percursa, Ag. Spec. Alg. 1., 

 p. 424. 

 Descr. Enteromorpha percursa, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 352. 



Syn. „ ,, J. Ag., Alg. Mar.Medit., p. 15 ; Id. Till. 



Alg. Syst. vi., p. 146 ; Hauck, Meeresalg. 

 Ulva percursa, Le Jol., Liste. p. 55. 



Tetranema percursa, Aresch. Phyc. Scand. Mar., p. 192. t. 2. A. 

 Schizogonium percursum, Ktz., Spec. Alg., p. 351 ; Id., Tab. Phyc. 



ii., t. 99 f. 3. 

 Diplonema percursum, Kjellm., Alg. Arctic Sea, p. 302. 

 Hab. On the sand between tide-marks. Fenham Flats ; Berwick Bay, 

 and elsewhere along the coast. May — Oct. Rare. 



Enteromorpha canaliculata, novum nomen. 



Descr. Ulva marginata, Le Jol., List., p. 53. 



Exsicc. Enteromorpha marginata, Le Jol., Alg. Mar. Cherb. no. 208, 

 (non E. marginata; J. Ag., Alg. Mar. Medit., p. 16.) 



Fig. Enteromorpha marginata, Tab. Nost. vn., figs. 5-7. 



Hab. On rocks near high-water mark. Berwick Bay. On the walls of 

 the Quay at the Carr Rock. Greenses. 



The plant described by Le Jolis I.e. under the name Ulva 

 marginata does not seem to be identical with J. Agardh's E. 

 marginata, I have therefore ventured to give it a new name. 

 The species is well marked by its slender, nearly simple, canali- 

 culate fronds. 



