338 K.JELLMAN, THI': ALGiB OF THE ARCTIC SEA. 



Ceramium rubrum f. squarrosa. Fig. 7. 



Fig. 7. Part of specimen bearing tetrasporangia. '/j. 



Rhodochorton intermedium. Fig. 8. 



Fiy. 8. Part of full-grown specimen. '/i- 



Rhodochorton Rothii f. globosa. Fig. 9—18. 



Fig. 9. Specimen, seen from the surfaee. 'Yi- 



» 10. Part of tlie basal layer of the frond. ^""/i- 



» 11. Branch-system issuing from the basal layer. ^^/i. 



I) 12. Lower part of the maiii axis of such a braiich-system. ^""/p 



" l-j. Upper part of a branch of the last order hut one. ^""/i- 



PLATE 16. 

 Antlthamnion Pylaissei f. norvegica. Fig. 1. 



Fig. 1. Upper part of a full-grown specimen. '"/,• 



Antlthamnion boreaie f. typica. Fig. 2—H. 



Fig. 2. Lower part of a branch-system of the tirst order. *%. 

 » 3. Top of another. '"'/j. 



Antlthamnion boreale f corallina. Fig. 4 — .'<. 



Fig. 4. Lower part of a branch-system of the first order. **"/,. 

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



Rhodochorton mesocarpum f penlcllllformis. Fig. C— 7. 



Fig. 6. Part of specimen bearing tetrasporangia. ^Vi- 

 " 7. Part of branch with tetrasporangia. ''""/r 



PLATE 17. 

 Diploderma amplisslmum. Fig. 1—3. 



Fig. 1 — 3. The plant at difterent ages. '/V 



Porphyra abyssicola. Fig. 4. 



Fig. 4. Full-grown specimen. '/i- 



