THE FULUS TERREST RIS. 419 
divided into segments than the anterior, the first five segments 
being most distinctly marked. On the fourth day the sixth and 
seventh segments are more defined. New segments are formed 
gradually in the membrane which connects the seventh with the 
eighth segment, and this last is always the last segment but one 
throughout the life of the IZyriapod (Fig. 4). On the ninth day the 
changes have advanced much farther. Not only have the future new 
segments become more distinct, but transverse depressions are also 
seen on the dorsal surface of the original segments, showing their 
division into double ones, as in the perfect animal. The rudi- 
ments of legs are now further developed, and their transparent 
further extremities are seen to be applied closely together and 
extended along the ventral surface of the body as in the nymphs or 
pupz of true insects. The antenne and ocelli are more apparent, 
and the embryo itself has increased at least one-third of its original 
dimensions. It has thus continued to grow through nine suc- 
ceeding days since the bursting of its shell without any visible 
means of nourishment, the nutriment supplied by the yolk having 
been exhausted before that occurrence. It becomes a matter of 
inquiry, then, from whence is it nourished ? whether it has already 
sufficient materials derived from the egg and stored up within 
itself for its future development, or whether the external enclosing 
membrane may not stili contribute to the function of nutrition 
by absorbing fluid condensed from the air of the humid locality 
in which it resides? “The probability of this last supposition,” 
writes Mr. Newport, “is somewhat countenanced by the fact that 
I have constantly observed the membranes of the embryo at this 
period covered with microscopic drops of fluid, but whether this 
is fluid condensed on the membranes from the atmosphere of the 
dwelling, or whether it results from the transudation of that which 
was once contained within the membrane, remains for future 
inquiry.” It is to be observed, however, that the weight of the 
embryo was not determined repeatedly by Mr. Newport, and 
this is to be regretted, because it would have settled the matter 
at issue. With regard to the internal construction of the body 
at this period, it was observed that the alimentary canal was 
nearly complete, some liver ducts were seen, and the great di- 
visions of the digestive organs also. 
BB 2 
