50 
the excretory vessels and the polar fields are still somewhat smaller 
than normally. 
On the 28th only three pieces from the specimens B and C 
were alive, among which fortunately the piece with the wrongly 
coalesced lobe. It had now regenerated the statocyst. The lobe 
was rnuch reduced in size, and the lobe vessels redueed to a simple, 
thin canal; but from the edges strong, irregular cana ls had formed, 
and there were indications of the formation of new, normal lobes. 
The new ribs had not been formed. The length of this piece was 
now only 6 mm. a very considerable reduction in size fronr the 
16 mm., when the specimen was divided. — It can scarcely be 
doubted that the piece would have regenerated, under suitable con- 
ditions, into a complete, normal specimen. 
The two other pieces had 8 ribs of nearly equal size; new 
lobes were formed, and the statocyst present. They were only 5 mm. 
iong. It could not be seen with certainty which specimen belonged 
to A and wh’ch to B. 
Though the experiments are carried out in a somewhat un- 
satisfactory way, partly because I could not follow them as care- 
fully as desirable on account of my absence on excursions, partly 
because I am no expert in experimental work, it seems to me that 
the results are quite noteworthy. It has been proved that the 
regeneration of so essential an organ as the statocyst 
is a ve ry easy task for the Bolina, as is, of course, the re¬ 
generation of other parts of the body, e. g. the lobes. But still 
more astonishing is the faet that when the animal is divided 
longitudinally into two parts, after the sagittal or the 
transversal axis, each part regenerates into a complete 
new animal. That it may also be possible to divide it trans¬ 
versally so as to get two complete specimens out of it, I do not 
doubt; in the experiment undertaken kere the upper part has only 
been a little two small; if the cut had been placed a little further 
down also the upper part would probably have regenerated completely. 
Regarding the apical organ it has been shown that the an i- 
