5 



longitudinal partitions into several wedge-shaped cells, which in- 

 crease rapidly in size, and form a. partial ring around the un- 

 changed cell which is on the concave side. The wedge-shaped cells 

 divide repeatedly until they are transformed into radiating fila- 

 ments, each cell of which develops into a spore. A mature spore- 

 mass is shown in fig. lo. The sub-moniliform spores are 

 embedded in a mass of jelly which nearly encloses the carpogen- 

 ic branch of which the lower portion is shown in the figure. 



Although the present alga resembles somewhat species of 

 Nemalio7i and Nemastoma, the central axial filament excludes it 

 from Nemasto7na, and the development of the cystocarps is not 

 that oi Nemalion. Considering the structure of the frond alone, 

 it might belong either to Calosiphonia or Gloeosiphonia, The 

 radiating arrangement of the spores, which all mature at the same 

 time, seems to warrant placing it in Gloeosiphonia. The account 

 of the development of the cystocarp given above, although de- 

 ficient in an essential point, conforms better to what is known in 

 Gl(£osiphonia than in any other genus. The trichogyne c and 

 thehypogynous cell a of my fig. 6 agree v/ith the account of G, 

 capillaris given by Bornet in Notes Algol., i., 42, Plate XIII, 7, 

 and by Fr. Schmitz in Sitzungsber. Berlin Akad. Wiss,, x., 

 Plate V, 8. According to Bornet the carpogenic cell is in close 

 contact with the trichophoric apparatus. This appears not to be 

 the case with G, verticillaris, in which the carpogenic cell is on a 

 separate branch, more like the figure of Schmitz. I have been 

 unable to ascertain the mode of contact between the trichophoric 

 apparatus and the carpogenic cell, for I find nothing in my ma- 

 terial which shows a growth of tubes like the c and c-\ in 

 Schmitz's fig. 10, We cannot suppose that the fertilizing im- 

 pulse is propagated down the whole length of the trichophoric 

 branch and up to the cell b of fig. 6. As no connecting tubes 

 were seen, it may be that the carpogenic branch when in Its nor- 

 mal position curves closely over the trichophoric branch just be- 

 low a and that a communication is there established. No dis- 

 sections and no reagents which I have tried, showed this, how- 

 ever. 



Nemalion Andersofiii, Farlow. A 

 was given in Proc. Am. Acad. Arts 



Since 



