79 
Endnu tydeligere er det, at Archer har set den 4-cel- 
lede Gonium*). Jeg aftrykker alt, hvad der siges om den: 
»Mr. Archer showed a form of volvocinaceous plant, which 
à priori might be looked upon as an undescribed species of 
Gonium. He had found this before, in May least, on the occasion 
of the excursion of the Club to the Vale of Ovoca, and, again, in 
a gathering made by Dr. Barker, and subsequently by himself 
in the Poenix Park. This little organism seemed to differ 
from Gouium pectorale in having the constituent cells, but 
four only, not sixteen; also in the form of the cells, which 
were much drawn out towards one side of the little tablet, 
that, indeed, whence cilia originated; seen laterally, they 
showed an ovale outline; self-division of the cells took place 
much as in G. pectorale, but stopping, of course, when, divided 
into four; and here a possible fourther distinction presented 
itself in that, — whilst in G. pectorale the self-division is 
successionel, here it apears to be simultaneous. This, however, 
is a question, so far as it may bear, open to further exami- 
nation; at least, Mr. Archer, had not found any constituent 
cells of these little tablets otherwise than undivided or divi- 
ded into four; he had not seen them halved or divided into 
two daughter- cells only.« 
Efter min Mening raaa den 4- cellede Gonium være en 
egen Art. Derfor taler for det første Tallet, der lige saa 
konstant er 4, som det hos G. pectorale (og Helveticum) er 
16. En Borgen herfor er, at den er iagttagen af i det mind- 
ste fire Botanikere, uden at de have seet den overskride dette 
Tal, og at man aldrig har fundet normale Mellemformer mel- 
lem den og G. pectorale, eller fundet en anden normal De- 
lingsproces hos G. pectorale end af en Celle 16 nye (2x2x 
2x2). Men dertil komme nogle andre Forhold, som ere af- 
vigende. Et fælles Slimhylster har jeg ikke kunnet finde, 
dog det kan ingen Betydning have, thi ogsaa hos G. pectorale 
Proceedings of the Dublin microscopical club 16, March, 1865; cfr. Quar- 
terly journal of microscopical science, vol. V, New. serces, 1865; S. 234. 
Dr. 0. Nordstedt hâr velvilligt gjort mig opmærksom paa denne Meddelelse. 
