128 
MU. NEWPORT ON THE ORGANS OF REPRODUCTION, 
eighteenth, was now almost as much developed as the preceding ones, and the white 
germinal membrane, extended from it, showed the formation below it of six new seg- 
ments. In this state the young animal lay coiled up awaiting its change. 
On the sixty-third day the animal again changed its skin, and entered its sixth period 
of development. It then had acquired twenty-seven segments to its body, which had 
greatly increased in size, and was of a brown colour. It had six distinct ocelli on 
each side of the head, and all the segments, to the eighteenth inclusive, were furnished 
with legs, of which it had now fifty-eight. Six additional new segments had also been 
developed to its body, as in the preceding changes, anterior to the penultimate seg- 
ment ; and the germinal membrane behind them ( i ) was still in further course of 
development, the penultimate segment still remaining unchanged. The six segments 
from which legs had now been developed had also the foramina repugnatoria marked 
with small spots, while the spots on the preceding six had become larger and darker 
in colour. The chief difference now consisted in the appearance of the thorax, which 
is of a lighter colour than the rest of the body. The animal may now be regarded 
as having acquired all the essential parts of its body. Time and circumstances pre- 
vented me from following its transformations still further ; but sufficient, I trust, has 
already been observed to claim from naturalists a little more attention to the remark- 
able series of phenomena connected with its growth, and to add to the importance 
of watching the development of this greatly neglected, but most singular group of 
animals. 
Recapitulation and Conclusions. 
The conclusions to which the facts detailed in this paper seem to lead, are, I think, 
as interesting to the zoologist, in reference to the situation which this remarkable 
class, the Myriapoda, ought to occupy in the arrangement of animals, as to the com- 
parative anatomist, and physiological inquirer. The evident conformity to one type 
of the organs of reproduction in the two sexes, is in accordance with the views now 
advocated by the best anatomists. It has been seen that the Iulidee, in some parts of 
their organization, as in the organs of reproduction, approach in their internal struc- 
ture to the true insect, in maintaining, although in a simple state, a perfect form of 
development ; while, in the external parts of the same organs, as in the double outlets 
of the female, and double organs of intromission of the male, they again recede to 
the type of those in which these organs exist in one of the lowest forms of develop- 
ment. 
The structure of the ovum in lulus approximates to that of the higher classes, and 
is in accordance with the observations of Wagner, Bischoff, and of Dr. Martin Barry, 
whose invaluable researches on this subject have so recently enriched the Transac- 
tions of the Royal Society. The same reasons that induced this last inquirer to ad- 
vocate the existence of the membrana vitelli and chorion in the earlier stages of the 
ovum of higher animals, have also led me to believe in its existence in these lower 
