676 PROCEEDINGS OF SCIENTIFIC SOCIETIES. . 
We cannot suppose a special creation of organized beings for the 
Alpine summits. Chionobas semidea, thus far only known to inhabit 
the summit of Mount Washington, may still be found northward; or, 
if not, probably became extinct north, finally localizing itself on the 
Single peak where it now occurs. 
“ On the oie agm of a Dragon-fly, Diplaz.” By A. S. Packard, 
jr.. M.D. 1. In all the eggs observed, the blastoderm had been 
formed, and Adie the blastodermic cells had disappeared, and, 
at this stage, there was a clear space about what is probably the ante- 
ee pole of the egg, where the head is eventually to be developed. 
. In the next stage (Fig. 1) the head is partially sketched out, with ` 
is re bel the limbs mouth-parts; and the sternites or ven- 
ral walls of the thorax rt of the two 
dy rings of the head appear. The an- 
terior part of the head, ‘ne so-called 
« procephalic lobe” overhangs and con- 
eals the base of the antenne. 
The antennz, mandibles, and maxille 
form a group by theinselves, while the 
e 
Fig. 1, a. men, those at the extremity appearing 
ast. 
The development of the hinder or 
post-oral rings of the head, together 
with the antennal segment, i. e. the first 
one in front of the mouth, at this time 
accords with that of those of ree tho- 
dages are identical throughout. 
3. In the next stage (not figured) the 
yolk is gears | walled in, though no 
Ventral view of the same. traces of segments appear on the dorsal 
and pleural areas. The yolk granules fill the sate cavity of the body 
extending into the appendages. The head has enlarged, the perenne 
abdominal urites appear, and the abdominal lobe or post-abdom 
