Fam. Ceramiaceæ. 



Antithamnion Nag. 



14. A. IMiimiila (Ellis) ïhur. ß. boréale Gobi, К. Rosenv. 

 Grl. Havalg. p. 787, Deux. Mém. p. 21. 



This variety has been gathered in many places on the 

 eastern coast of Greenland. It mostly grows on other algae, 

 such as Polysiphonia arctica, Euthora cristata, Ptilota pecti- 

 nata, etc. Its normal length seems to be 2 cm., but a few 

 specimens attain a greater length, up to 3 cm. Glandular cells 

 were frequent. The main part of the material gathered in June 

 and July is sterile, and only a few plants collected in the latter 

 part of June had normally developed tetraspores. It was col- 

 lected in a depth of 3 — 5 and up to 30 fathoms. 



Gr. or.: Кар Dan, Tasiusak (3—30 fathoms), Kakasuak, Ang- 

 magsivik, Stenö, Ödesund, Nualik, Кар Dalton, Turner Sund (sheltered 

 shore, rapid current, 3 — 5 fathoms), Sabine Ö (exposed shore, 3—8 

 fathoms). 



Ptilota C. Ag. 



15. P. pectinata (Gunn.) Kjellm., K. Rosenv. Gr. Havalg. p. 790, 

 Deux. Mém. p. 22. 



This species seems to occur just as frequently on the eastern 

 as on the western coast of Greenland. The material collected in 

 January and May — September was sterile. The largest specimens 

 were 20 cm. long. Found in a depth of 3 — 19 ( — 30) fathoms. 



Gr. or.: Кар Dan, Tasiusak, Kakasuak, Kangarsik, Smalsund, 

 Ödesund, Sabine Ö (exposed shore, 3 — 8 fathoms). 



Rhodochorton Näg. 



16. R. Rothii (Turt.) INäg., К. Rosenv. Grl. Havalg. p. 791, 

 Deux. Mém. p. 23. 



The specimens I have had for examination were collected 

 in May, June and July, and are almost all sterile ; only a few 

 abnormally developed, but conspicuously quartered tetrasporangia 

 were found in a sample gathered in July. The specimens attain 



