28 
Later on, several species were described, partly really new 
partly also forms which had already been described. By reason of 
this and also from the fact that the same species has been refer- 
red to different genera, the nomenclature has been highly en- 
tangled and the attempts which have been made to correct this 
failure have for the most part been far from successful. In this 
connection I måy mention the paper by Murray and Boodle: 
SA systematic and structural account of the genus Avrainvillea 
Decne.” (Journal of Botany, Vol. 29, London 1889, p. 67), where 
not only the definition of species but also the nomenclature for 
the most part is highly unsatisfactory. Howe has in a recently 
published paper: ”Phycological Studies — III. Further notes on 
Halimeda and Avrainvillea” (Bulletin of the Torrey Botanical Club, 
vol. 34, 1907, pag. 491) tried to bring clearness in this disorder. 
Even if his paper shows a great progress I cannot agree with him 
in all points. Later on I shall come back to this matter. 
In the Danish West Indies I have only found this genus in 
deeper water, for the most part in about 20—30 meters, while in 
other places e. g. at Jamaica it also occurs in quite shallow water 
as I have myself seen. 
Avrainvillea Decaisne. 
Avrainvillea comosa (Bail. et Harv.) Murray et Boodle. 
Murray, G. and L. A. Bodle, Å systematic and structural 
account of the genus Avrainvillea Decne (Journal of Botany, vol. XXVII, 
1889, p. 71). Chlorodesmis comosa Bail. et Harv. in Harvey, 
Nereis Boreali-Americana, Part III, 1858, p. 29. 
Only one specimen was found which I refer, not without doubt, 
to this species, my plant being somewhat different from the speci- 
mens I have seen from the eastern hemisphere. 
The plant had no stipe; it was of a dark yellow-green colour 
and consisted of a large tuft of intertwined filaments about 6—8 cm. 
high. It was of a very loose consistency, the filaments being for 
the most part free; it was fastened to the bottom by means of 
