51 
mal is capable of swimming quite normally, wlien the 
organ is extirpated. But it appears to have some i n- 
fluence on the regeneration, the parts with the statocyst 
preceding those without such in the regenerating process. Another 
noteworthy faet is the reduction in size of the regene¬ 
rating specimens; this evidently means that the material for 
the formation of the new parts is taken from the other parts of 
the body — indeed, the animal has no other way of doing it so long 
as it is not able to take food. 
It was, indeed, a great disappointment to me that I could not 
get the opportunity of carrying these oxperiments farther. There 
are many more interesting problems to solve in Bolina — (I wanted 
especially to try how far the division could be carried on and to 
see if it is possible to graft together parts from different specimens) 
and above all it would be interesting to try such experiments on 
other Ctenophores. Judging from observations made in the Trond- 
hjemfjord 1911 I cannot doubt that Beroe cucumis is also capable 
of regeneration to a large extent, and from my observations on 
the two small specimens of Pleurobrachia which I got at Plymouth 
this summer I am also inelined to think that it will prove to have 
a similar regenerating power. 
In any case the Ctenophores form most wonderful objects for 
experimental work, not only their eggs and embryos, but also the 
grown specimens. 
25.—10—1913. 
4* 
