Marine, Alcj(( j of Berwick-on- Tweed. 223 



of Trieste, Prof. J. Gk Agardh of Lund, Dr. F. E. Kjellman of 

 Upsala, Dr. H. Stromfelt of Stockholm, Prof. W. G. Farlow of 

 Harvard College, Prof. J. Eeinke of Kiel, and Prof. E. Perceval 

 Wright of Dublin, for valuable assistance in the identification 

 of species ; and through the kindness of Dr. Bornet to M. 

 ftomont for aid in identifying the Oscillarice. 



Before giving the list in detail it may be useful, as a guide in 

 selecting a collecting ground, to enumerate a few of the most 

 interesting species to be met with at the principal stations within 

 our limits. Everywhere along the coast the oar-weeds and Fuci 

 are abundant; Laminaria hyperborea (L. Cloustoni Le Jol.,} L. 

 digitata (L flexicaulis Le.Tol.,) L. stenophylla and Alaria esculcnta 

 grow luxuriantly at low water mark ; while Funis resiculosu*, F. 

 platycarpus, F. serratus, and Ascophyllum nodosum cover the rocks 

 between tide-marks. Many species seldom to be met with south 

 of Scotland such as Dietyosiphon hippuroides, D. mesogloia, 

 Stictyosiphon tortilis, S. sub-artieulata, Euthora cristata, Odonthalia 

 dentata, etc., are abundant ; and even the Arctic species Ulothrix 

 disci/era is not uncommon at Berwick. 



To the south of the Tweed the shore is flat and sandy, inter- 

 rupted sometimes by elevated ridges of sandstone rock — at others 

 by muddy salt marshes ; the stations of interest to the algologist 

 are consequently few on this side of the river. The rocks 

 situated between Spittal and Scremerston, however, produce a 

 few interesting species, such as Calothrix Crustacea, C. scopulorutn, 

 Ulothrix isogona, Rhizoclonium riparium, Codiolum gregarium, 

 Ralfsia verrucosa, R. clavata, Battersia mirabilis, Sphacelaria 

 plumigera, Petrocelis cruenta, Hildenbrandtia rosea, Callithamnion 

 polyspermum, C. Hooheri, Ceramium acanthonotum, Delesseria 

 iinuosa, Catenella opuntia, Polysiphonia atro-rubescens, etc., etc. 

 On the salt marshes facing Holy Island, Oscillaria littoralis, Crn., 

 0. msignis, 0. subuliformis, Microcoleus chthonoplastes, Lyngbya 

 majuscu/a, L. ccstuarii, Sphczrozyga Carmichaelii, Fnteromorpha 

 Ralfsii, E. clathrata, Chcctomorpha linum, Cladophora fracta, and 

 C.flnvescens are to be found, and a few species rarely to be met 

 with elsewhere within our limits, such as Desmarestia Ugulata, 

 Mesogloia vermicularis, Saccorhita bulbosa, and Lithothamnion 

 calcareum occur at the Coves, Holy Island. 



North of the Tweed between the Pier and Sharper Head, 

 Rivularia atra var. confluens, Calothrix Crustacea, C. scopulorum, 

 Ulothrix isogona, Codiolum gregarium, Ralfsia spongiocarpa, R. 



