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 I 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 Q'J^ 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 t^g ; since there are strong reasons for believing that those which are developed 

 earliest from the Qg^ undergo their changes most rapidly, while those last developed 

 are later than the others at each succeeding change, so that some specimens may be 



