276 Mr George Traill on the 



CALOTHRIX, Ag. 



5. Calothrix confervicola (Dillw.), Ag. 



Epiphytic on Sphacelaria cirrlwsa, Cladoj^hora rupestris, Cera- 

 mium nthrwv, Geraviium acanthonohmi, Ceramium Deslongchampsii, 

 and other small Alga;, in pools above half-tide level. Always 

 submerged. Annual. Summer and autumn. (" Summer," Le 

 Jolis.) 



6. Calothrix pulvinata (Mert.), Ag. 



Usually on vertical rocks in the shade ; also epiphytic on Fueus 

 vesiculosus and Pelvefia canaUculafa, near high-water mark. All 

 the year. Occurs in some abundance at the base of the cliffs west 

 of Dunbar, near the " Sucking-in-Goat ; " also abundantly, and in 

 very fine specimens, on rocks east of the esplanade. (G. W. T. 1881.) 



6a. Calothrix fasciciolata, Ag. 



On vertical rocks in the shade near high-water mark at the base 

 of the cliffs west of Dunbar, associated with the preceding species. 

 (G. W. T. 1890.) All the year. 



7. Calothrix scopulorum (Web. and Mohr), Ag. 



Plentiful on rocks near high-water mark, at several places, 

 especially to the west of the castle. All the year. 



Class IL— CHLOROPHYCEJE. 

 Order II.— CHLOROZOOSPORE^. 



Family. — ULV ACEiE. 

 PRASIOLA, Suhr. 



8. Prasiola stipitata, Suhr. 



On rocks and boulders at about the high-water mark of neap 

 tides. All the year. Usually in best condition in winter and 

 spring ; and poor in summer and autumn. Fruit in February and 

 March. Left uncovered by the tide, and exposed to the light for 

 many hours daily. ISTot uncommon east of the old harbour ; also 

 below the cliffs west of Dunbar, near the boys' bathing pool. 



MONOSTROMA, Tlnir. 



9. Monostroma Grevillei (Thur.), Wittr. {Ulva laduca, Harv.) 



At about half-tide level at the burn at the esplanade. AnnuaL 

 March to June. Epiphytic on Cladopliora rupestris, &c. 



ENTEROMORPHA, Link. 



10. Enteromorpha clathrata (Roth), Grev. 



In pools at about half-tide level. Annual. April to September. 



11. Enteromorpha compressa (Linn.), Giev. 



Common on rocks and stones between tide marks ; also epiphytic 



