— 150 - 



Of these I shall here point out that the size of the cells in 

 the West Indian plant is more than double that in Enteromorpha 

 torta, and the form of the cell is very regularly rectangular or 

 nearly square when seen from above in the first-mentioned form, 

 much more irregular with rounded corners in E. torta. Whilst 

 the wall of the cell is rather thin and the outer wall quite even 

 and the arrangement of the cells upon the whole very regular in 

 the West Indian plant, the cells in Enteromorpha torta have thicker 

 walls, especially the outer wall, the surface of which is quite un- 

 even, and the arrangement of the cells is also not so regular, 

 even if the cells here also are arranged rather distinctly in long- 

 itudinal and also more or less in transverse rows. Whilst my plant 

 is always cylindric, Enter om. torta is flat, and whereas proliferations 

 are very seldom in the first mentioned, these seem to occur more 

 commonly in E. torta. These differences show clearly that my 

 plant cannot be considered as belonging to E. torta Reinb. 



Another species to which our plant, judging from the descrip- 

 tion, might perhaps have some resemblance is Enteromorpha mar- 

 ginata J. Ag. 1 ) Having examined an original specimen (from Nizza), 

 I find that this species, which stands rather near to Ent. torta, 

 is very different from our plant. It has very small cells, about 5pt 

 only in diameter, the cells are square, rounded at the corners, and 

 arranged sometimes in longitudinal rows sometimes without order, 

 the filaments containing in one part only a few rows of cells, then 

 growing broader with several rows of cells, by reason of which 

 the breadth of the filaments is rather variable; all characters which 

 show that it is very different from our plant. 



I think therefore that we are obliged to consider this form as 

 a new species, for which I propose the name Enteromorpha chœ- 

 tomorphoides; herewith a short Latin diagnosis: 



Fronde filiforrni cylindrica, tortuosa, simplici, vel rarissime 

 prolificationibus instructa. Thallo sæpissime solido, ex tribus (in 

 prolificationibus aut • duobus aut singulis) seriebus cellularum 

 composito; interdum crassiore et tubuloso, plures series cellularum 

 continente. Gellulis majoribus, subquadratis vel rectangularibus, 

 16—18 ^ crassis. Fig. 12. 



Lat. til. 3 ser. cellularum composita = 45 ß. 

 Lat. prolific, tenuior . = 15—16//. 



l ) J. A g ard h, Algæ maris Mediterranei et Adriatici, Paris 1842, p. 16. 



