2 MM. Kowalevsky and Barrois on Anchinia. 
than the time indicated by Vogt; we have only found it 
occasionally between the months of February and April, and 
each time in very small numbers. 
2. The only form of Anchinia that is known (PI. IL. fig. 1) 
consists of fragments of zooid-bearing stolons of perfect trans- 
parency, which are found floating, like the Salpee and Pyro- 
somes, at the surface of the sea. 
Our materials for investigation have been rather scanty ; 
we have met with the Anchinia only three times, and the 
first time in bad weather and in a state unfit for examination. 
Of the two colonies afterwards captured the first alone bore, 
as described by Vogt, zooids in different stages of gemmation ; 
it is this that we have made use of in our investigations. 
The second presented zooids all of the same grade, in the 
adult state. This is a state mentioned by Rathke, but not 
met with by Carl Vogt. Its existence shows that there is not 
in this case continuous gemmation at the surface of the stolon, 
but an unequally rapid development of a series of previously 
formed germs. 
We have not had the opportunity of confirming the obser- 
vation of Vogt, who, in the great number of specimens 
exaroined by him, constantly found one individual surpassing 
the others in size and attaining as much as a centimetre in 
length. Nothing of this kind existed in the two specimens 
examined by us. 
3. No observer has as yet given us any information as to 
the form of generation represented by the zooids attached to 
the surface of the stolon. Vogt did not detect in them any 
distinct traces of a stolon or of genital organs; one only 
of the specimens examined by him showed more or less 
oviform bodies ; but he does not come to any decided conclusion 
upon this point, and it is even difficult to make out exactly 
what the olive-green bodies indicated by him in this indi- 
vidual really represent. 
In our Anchinie we have always found perfectly visible 
genital organs, consisting of a testis and an ovary (PI. III. 
fig. 8, ¢, 0), situated at the lower part of the intestine, be- 
tween the heart and the peduncle, and opening by a common 
canal into the right expansion of the cloacal sac; it is there- 
fore now absolutely certain that the known Anchinia is a 
sexual form. 
4, The stolon upon which the zooids are fixed is, according 
to Vogt, a cylindrical contractile canal, with thick walls, com- _ 
posed of longitudinal and transverse fibres, and lined within 
with a very fine vibratile epithelium. 
Unfortunately we have been unable to study the structure 
