124 
MR. NEWPORT ON THE ORGANS OF REPRODUCTION, 
filled with food. The new segments were still soft and delicate, and the anal segments 
were still employed in locomotion, as above stated. The germinal space now showed 
indications of the formation of other new segments. Each of the new segments had 
been much increased in size, from the eighth to the thirteenth inclusive ; those most 
anterior being the most perfect. The fourteenth, or penultimate segment, as before 
shown, still maintained a great superiority over the rest in point of size and colour, 
although the whole had become darker, and were thus more clearly distinguished from 
the thirteenth or ante-penultimate, and germinal space, which are always whitish and 
delicate. The annulus around the ocellus was now of a more triangular form. There 
were a few scattered hairs on the anal segment and the under part of the body, as 
well as on the antennae and parts of the mouth. The temperature of the atmosphere 
was about 70° Fahr. 
On the thirty -first day (fig. 18.) the new segments had acquired a darker colour, 
and become further developed, and were almost equal in size to the original ones; but 
the thirteenth, and the germinal space, were still whitish and delicate. No additional 
legs had yet been developed, but there seemed to be a little distention of the under 
surface of the eighth segment in some of the largest and most active specimens, and 
in the whole of them a slight alteration of position had taken place in the six true 
legs. The prothoracic legs (2.), approximated at their base, were situated more 
closely to the anterior of the mesothoracic segment (3.), while those of the latter, in 
like manner, approached the generative or fourth segment ; and those of the fifth 
segment, which 1 regard as the proper metathorax, had advanced a little forwards to 
the fourth. In other respects the animal remained the same as on the previous day. 
On the thirty-third day (fig. 19.) it was evident that the high temperature of the 
atmosphere had accelerated the changes which in some of them seemed about to 
take place. The temperature of the atmosphere was now 67° Fahr. One specimen, 
that had undergone its change a few hours before, now exhibited two additional pairs 
of legs to the eighth segment (8. 18.), which on the previous days was enlarged on the 
under surface ; several specimens at this period underwent a change, but I am not 
certain whether they actually shed their skins, or whether the legs were simply deve- 
loped from the eighth segment by the extension of the old skin, as I did not actually 
witness the supposed exuviation of this covering. In other respects these individuals 
seemed to remain in the same condition as those specimens that had not cast their 
tegument, saving that the body was a little more extended, and the germinal space 
(13. g) was more developed. I cannot help regarding this change, therefore, as a 
pseudo -change, which takes place only under certain circumstances, such as repletion 
with food and moisture, and high temperature of the surrounding medium, operating, 
perhaps, on those specimens which were furthest advanced and first developed from 
the egg ; since there are strong reasons for believing that those which are developed 
earliest from the egg undergo their changes most rapidly, while those last developed 
are later than the others at each succeeding change, so that some specimens may be 
