QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 399 
through the kindness of Dr. J. Rostafinski, a copy of the 
paper from which I have already quoted, and in which I find 
he has proposed to rearrange the Volvocinee in the same 
way as I have done, and to constitute a new family, to which 
he had also given, apparently simultaneously, the name of 
Pandorinee. 
According to Rostafinski,! Hieronymus, since the autumn 
of 1872, has observed at Halle the conjugation of the micro- 
zoospores of Gonium. 
Hydrodictyee.—Rostafinski makes the interesting an- 
nouncement that (as I suggested was likely to be the case’) 
the microzoospores of Hydrodictyon have been observed to 
conjugate by Suppanetz in Prof. De Bary’s laboratory. The 
conjugation takes place while the zoospores are still within 
the mother-cell, or immediately after their emission. Not 
only two, but three and even six, zoospores take part in the 
formation of the isospore. That the zoospores of the same 
mother-cell should conjugate seems at first sight remarkable, 
but when it is remembered that from 30,000 to 100,000 are 
produced from each cell the whole mass of protoplasm must 
be so enormous relative to each individual zoospore that 
there is room for the amount of differentiation, which is at 
the bottom of the sexual process, to exist between the zoospores 
from different parts of the cell. The formation of the zygo- 
zoospore from more than two zoospores is also interesting as 
confirming Sachs’s view that the formation of the plasmo- 
dium of the Myzomycetes is to be regarded as a sexual 
process, and it is not superfluous to remark that numerous 
antherozoids effect the fertilization of the oosphere of the 
higher alge, such as Volvox, Vaucheria, and Fucus. 
Ulvacee.—Janczewski and Rostafinski have failed® to con- 
firm Areschoug’s observations on conjugation in Enteromorpha 
compressa. They observed the microzoospores attach them- 
selves in pairs by their beaks, but after a time these separated. 
They also met with pairs partially united together, and these 
they consider to be monstrous conditions by which Areschoug 
has been misled. On the other hand, they satisfied them- 
selves that the microzoospores are incapable of germination, 
and were consequently unable to attribute to them any func- 
tion. Thuret found the zoospores of Hnteromorpha clathrata 
** tous réunis deux a deux par le rostre,”* and this has been 
regarded as a monstrous condition. In Cladophora glomerata 
Cohn observed the fusion of two to five zoospores into a 
1 Loe. cit., p. 146. 2 Supra, p. 304. 
3 “Mém. Soc. Sc. Nat. de Cherbourg,’ 1874, p. 372. 
4* Ann. des Sci. Nat.,’ 3e série, xiv, p. 244. 
VOL. XV.—NEW SER. DD 
