338 K.TEI.LMAN, THE ALG^. OF THE ARCTIC SEA. 



Oeramium rubrum f. squarrosa. Fig. 7. 



Fig. 7. Part of specimen bearing tetrasporanf[ia. Vi- 



Rliodocliorton intermedium. Fig. 8. 



Fig. 8. Part of full-grown specimen, '/j. 



Rhodoehorton Rothii f. globosa. Fig. f)~l.^. 



Fig. 9. Specimen, seen from the surface, ^j-y. 



» 10. Part of the basal layer of the frond, ^o^/j. 



» 11. Branch-system issuing from the basal layer. *%. 



» 12. Lower part of the main axis of such. a branch-system. ^™/i. 



» 13. Upper part of a branch of the last order but one. ^""/i- 



PLATE 16. 

 Antithamnion Pylaissei f. norvegica. Fig. 1. 



Fig. 1. Upper part of a full-grown specimen. '%. 



Antithamnion boreaie f. typica. Fig. 2—3. 



Fig. 2. Lower part of a branch-system of the first order. *"/j. 

 » 3. Top of another. *"/,. 



Antithamnion boreaie f. corallina. Fig. 4—5. 



Fig. 4. Lower part of a branch-system of the first order. '"Z,. 

 » 5. Top of a feeble branch-system of the first order, ^"/y. 



Rhodoehorton mesocarpum f. penicilliformis. Fig. 6—7 



Fig. 6. Part of specimen bearing tetrasporangia. *%. 

 » 7. Part of branch with tetrasporangia. '""/i- 



PLATE 17. 

 Diploderma amplissimum. Fig. 1 — 3. 



Fig. 1 — 3. The plant at different ages. Vi- 



Porphyra abyssicola. Fig. 4. 



Fig. 4. Full-grown specimen, '/j. 



