— 128 — 



or most often alternate or several occur at the same height point- 

 ing in different directions. The ramuli are longer or shorter, often 

 nearly cylindric, often also clavate, swollen towards the obtuse apex. 

 As pointed out by Reinke 1 ) the different parts of the plant are 

 only very little differentiated ; the erect axes can probably be easily 

 transformed to rhizomes and even the ramuli grow often out. Cau- 

 lerpa fastigiata and the nearly related, if on the whole specifically 



separated, C.filiforniis, I agree 

 with Reinke in considering 

 as the lowest form of the 

 genus. 



M me Weber in her mo- 

 nograph, p. 263, writes : "J'ai 

 été frappée en examinant les 

 filaments du C. fastigiata de 

 voir le sommet de plusieurs 

 filaments rempli de chroma- 

 tophores encore d'une intense 

 couleur verte". This I have 

 also found in my specimens 

 and it was visible even in 

 material preserved in spirit. 

 To this M me Weber adds: 

 u Suhr dans sa révision des 

 algues du Gap du Dr. Ecklon, 

 appelle l'attention sur un fait 

 analogue, observé par lui 

 chez le G. ligulata, et il sup- 

 pose que ce fait puisse avoir 

 rapport à une formation d'or- 

 ganes reproducteurs". In my 

 plant the more intensive col- 

 ouring seems to me in every 

 case to be easily understood from the dense Ægagropila-Wke growth 

 of the plant, where often only the apices of the axes were free 

 and exposed to the light. 



Only found once: At Cruz Bay, St. Jan. 



Fig. 1. Caulerpa fastigiata Mont. 



From Cruz Bay, St. Jan. About 10: 1. 



l ) J. Reinke: Ueber Gaulerpa. Ein Beitrag zur Biologie der Meeres-Organis- 

 men, pag. 7. (Wissensch. Meeresunters., N. F., Bd. 5., Kiel 1899.) 



