194 The Siphonophores. [ March, 
are duplicated in one and the other. What are the changes of 
form which in subsequent growth so alter the external form as to 
produce in the one case a Lizzia, such as I figure (Fig. 10), and in 
the other an Agalma ? 
In the figure of Lzzzta octopunctata Forbes (grata Alex. Agassiz), 
a species common in Massachusetts bay, several buds can be seen 
through the bell, forming on what is known as the proboscis. If 
these buds are closely examined, it will be found that they are 
young Lizzie in different stages of growth, and if the proboscis of 
the largest of these buds be minutely studied, on it will be found 
buds of still a third generation, grandchildren of the original jelly 
fish. All these buds whether products of the first or second budding 
process, eventually break away from the place from which they 
first formed as buds, and swim away as jelly fishes, the form of 
which is not unlike the parent from which they sprung. Even be- 
fore that separation takes place, the impatient young may be seen 
opening and shutting their bells, and swinging on their fragile 
stems trying to break themselves loose. 
Suppose now that the proboscis of the Lizzia from which the 
buds formed was very much elongated into a tube. This tube 
then we liken to the axis of an Aga/ma, and if buds were formed 
along its whole length, as can be very easily imagined, the like- 
ness would be even more striking. To be sure all the different 
buds in the Agal/ma are not of the same form or outline. 
Neither are they alike in the Lizzia. Some are very fully grown 
while others are in incipient stages of growth. This variety in 
shape could not then be an objection to the comparison which I 
have urged. 
Each bud which forms along the stem of an Agalma is called 
by some naturalists an individual, from the fact that in early 
stages they resemble each other so closely, and when fully 
grown oftentimes certain of them bear such a close likeness to 
forms of Medusz, which lead an independent life. I do not 
consider every bud an individual, but think that in some cases 
the position on the stem or other causes has so modified them 
that two or even more buds, as in the case of polypite, and cover- 
ing scale together make one true individual. A zodid, as defined 
by zodlogists, does not seem to be a fitting term to apply to these 
structures found along the axis of an Aga/ma, unless the term be 
given the broadest extension. In such a case the distinction be- 
