Fewkes.] 
206 
[March 6, 
From a comparison of this oil-globule with the float of the adult, I 
have shown that a derivation of the young from the adult by bud- 
ding is improbable. Still oil-globules are very conspicuous struct- 
ures on the stem of the Nanomia and have not been observed by 
me in other genera. Consequently, although the tentacular knobs 
and most of the other structures of Nanomia are identical with 
those of Agalmopsis pictum , a genus to which I formerly referred 
Nanomia, the exceptional character of the cystons seems to me to 
separate it from Sars’ genus. 
This “ oil-globule” forms a swelling at the proximal end of the 
“ cyston” and was not observed to be ruptured. There seems in 
point of fact no opening through which it can be discharged. Its 
regular form, its constancy, its position, all stamp it as an organ 
of some kind. If we regard it as a float of a new individual it dif- 
fers very greatly from the adult float of Nanomia. If we consider 
it a pigmented accumulation of excretory matter we disregard com- 
pletely its character as far as the examination which has been 
made goes. It seems as if it should be regarded as connected in 
some w r ay or another with the function of the cystons, but how I 
am unable at present to say. 
Reviewing the data which have been brought forward, we have 
the following facts bearing on the discharges of a colored fluid from 
organs of the body or the modification in color due to irritation in 
Siphonopliores. 
1. Certain Agalmidse, Forskalidse and Apolemidse discharge a 
colored fluid from their cystons. This fluid is regarded as an ex- 
cretion and is supposed by Haeckel in one case to be the means of 
protection, as the sepia of the Cephalopoda. 
2. A typical genus of Agalmidse ( Agalma) has pigment glands 
on the bracts which discharge their contents when the covering- 
scales are broken from the stem. This discharge probably takes 
place on simple irritation. 
3. Certain Hippopodidse and a single known monogastric Caly- 
cophore, change color somewhat on irritation. (See Chun’s de- 
scription above.) 
4. Nanomia has a prominent pigmented “oil-globule” at the 
base of the cyston, which has never been seen to discharge its con- 
tents. 
What conclusions may be drawn from the above statements? 
