S44 TRANSACTIONS AND PKOCEEDINGS OF THE [Sess. LIX. 



This form has been found only at two other localities, 

 namely, Berwick and C umbrae, by Mr. Batters ; but the 

 typical form is found at several stations along the coast. 



4. Ceramium circinnatum (Klitz.), J. Ag. — In pools 

 between tide marks at Eisegjo, Xoustar, etc., sometimes 

 epiphytic on Codium tomentosum, and other small Algae ; 

 also in caverns, and damp shaded places. 



5. Clado-pliora utriuscida, Kiitz. — In clear shaded pools 

 between tide marks at a high level, with Litliotharania and 

 Corallina officinalis: especially in the vicinity of Pdsegjo. 

 Common. 



6. Enteromorpha minima, Nag. — On rocks between tide 

 marks, at a high level, at Sealskerry ; at the Lighthouse 

 pier ; and at the north end of the Island, generally. 



7. PhyllopJiora Traillii (Holm.), Batt. — On rocks north 

 of the lighthouse at low water, in the shade, in abundance, 

 and often in well-grown specimens ; also at Xoustar, in 

 dark crevices. All the year. Fruits in winter. 



8. Ectocarpus erectus, Kiitz. — Growing out of minute 

 cracks or flaws in the smooth rock at the bottoms of 

 shallow pools, at Xoustar, near high-water mark. 



9. Ectocarpus terminalis, Kiitz. — Epiphytic on Corallina 

 officinalis, Cladopliora rupestris, etc., in pools between tide 

 marks. Eisegjo, etc. 



10. Poli/siphonia pulvinata, Phyc. Britt. — In pools 

 between tide marks at the " Natural Bridge," rare. 



Ectocarpus vclutinus (Grev.), Kiitz. (Elachista vclutina, 

 Fries.). — Epiphytic on Himanthalia lorea ; usually assoc- 

 iated with Elachista scutulata. Annual. June to October. 

 Fruits usually in July and August. Omitted in my South 

 Eonaldsay list. 



The following, though not new, are deserving of mention 

 as specialties of the island : — 



Ceramium ciliatum, Ducluz. — In shallow pools at a high 

 level, a little to the north of Eisegjo ; common, but of 

 small size. This species was included in my " Marine 

 Algae of Orkney," on Harvey's authority, but no definite 

 locality has been recorded until now, 



Dcsrnarcstia ligulata (Light.), Ag. — Cast ashore in con- 

 siderable abundance after gales, and often of large size. 

 Fronds from 3 to 6 feet Ions. 



