330 Mr George Traill on the 



190. Delesseria hypoglossum (Wood.), Lamour. 



Fine and plentiful on rocks, and epiphytic on Laminaria lnjper- 

 horea, in deep water. Annual. Summer. Sometimes grows to 

 the height of 14 inches. Fine at Skaill Bay, West Mainland ; fine 

 near Broch in Rousay ; very tine in Kirkwall Bay. Two varieties, 

 a and (i, occur. 



191. Delesseria ruscifolia (Turner), Lamour. 



On rocks, and sometimes epiphytic on Laminaria hiiperhorea. 

 Annual. Spring, summer, and autumn. Kirkwall Bay; Carness; 

 Sacquoy Head, Rousay, in small specimens. 



192. Delesseria sinuosa (Good, and Wood. ), Lamour. 



Fine in sounds and tide-ways ; also on rocks, and epiphytic on 

 Algse, in deep pools between tide marks. Cast ashore at Skaill, 

 Rousay, very fine. Biennial. Fruit in winter and spring. 



Family.— SPH^ROCOCCACEiE. 

 SPH^ROCOCCUS, Stackh. 



193. Sphserococcus coronopifolius (Good, and Wood.), Ag. 



On rocky sea-shores at extreme low-water mark, also at a greater 

 depth. Perennial. Summer and autumn. Backaskaill, Sanday 

 (J. W. Gray); Kirkwall. 



GRACILARIA, Grev. 



194. Gracilaria confervoides (Linn.), Grev. 



On rocks and stones in the sea near low-water mark, and at a 

 greater depth. Perennial. Fruit in summer and autumn. Skaill 

 Bay, West Mainland. 



CORDYLECLADIA, J. Ag. 



195. Cordylecladia erecta (Grev.), J. Ag. {Gracilaria creda, Grev.) 

 Submerged in bays — Kirkwall Bay, &c. Determined by Harvey, 



and also by Messrs Holmes and Batters. Perennial. Stichidia 

 due in July ; capsules in September and October ; but no specimen 

 iu fruit has yet been found in Orkney. 



Family.- SOLIERIACE^. 



CATENELLA, Grev. 



196. Catenella Opuntia (Good, and Wood. ), Grev. 



In dark crevices and on vertical rocks in the shade near high- 

 water mark ; never in pools. Perennial. Tetraspores in July. 

 Hole of Howan, Skaill, West Mainland ; Crossiecrown, near Kirk- 

 wall. 



