— 259 - 



This species is found in rather exposed localities in shallow 

 water growing on rocks where it was constantly under the in- 

 fluence of the waves. 



St. Croix: Cane Bay, Sandy Point. 



D. intermedia Weber van Bosse. 



A.Weber van Bosse, I.e. p. 143. 



It is very doubtful, if this species really occurs on the shores 

 of the Danish West India Islands. I have only found a single small 

 specimen of the size of a large pea. It was massive but lacked 

 the needle-shaped processes in the interior of the cells. In these 

 characters it was in good agreement with the description of M me 

 Weber, but, as mentioned above, in D. van Bossece sometimes 

 cells occur without needles and as our plant, apart from the want 

 of these, seems otherwise to be very like it t in all regards it is 

 very possible that it is only a needle-less form of the above-men- 

 tioned species. 



The single specimen found was collected together with some 

 specimens of D. van Bosseœ in shallow water at Cane Bay, 

 St. Croix. 



Ernodesmis 1 ) nov. gen. 



Thallus ramosus, stipitatus, stipes rhizoideis ramosis substrato 

 adfixus, claviformis, in parte basali transverse annulatus, apice 

 obtuso, 5 — 10 ramos claviformes strictos gerens, qui ipsi in apice 

 obtuso leviter incrassato ramulorum claviformium fasciculis in- 

 structi sunt; sic ramificatio pluries regulariter redintegratur. 



Omnes rami totius plantæ pariete convexo basali ab inferiori 

 cellula discreti unaque cellula formati sunt. Rami præsertim in 

 parte superiori plantæ in zoosporangia poris pluribus aperta trans- 

 formât]'. 



Ernodesmis verticillata (Kütz.) nob. 



Valonia verticillata Kütz. , Species Algarum , p. 508, Tab. phycol, vol. VI, 

 tab. 88. J. Agardh, Till Algernes Systematik, VIII, p. 100. P. Kuckuck, 

 Über den Bau und die Forpflanzung von Halicystis Aresch. und Valonia Ginn, 

 (in Bot. Zeit., 1907). 



Valonia œgagropila ß élongata G. Ag., Spec. Alg., p. 430. 



Conferva diaphana West e speeim. in Herb. Vahl in Museo Bot. Hauniensi 

 (cfr. G. Agardh, 1. c). 



a ) From ëpvoç — a branch and deap.tg = a bundle. 



17* 



