558 
J. S. KINGSLEY. 
comes to"a similar conclusion, and carries it further, as follows 
(’ 84 , p. 200) : — “ Obwohl nun dieses segment [the f praeorale 
Abschnitt'] seiner Entstehung nach alien anderen des Korpers 
homodynam ist, glaub ich doch es denselben gegeniiberstellen 
zu miissen da es sich in ganz anderer Weise umbildet und 
niemals Organe erzeugt, wie sie alien anderen Segmenten aus- 
nahmlos^eigen sind ; es entstehen in ihm keine Segmental- 
organe, keine Driisenbildung, auch keine Extremitaten ; denn 
ob die Tentakel fur Gebilde gehalten werden diirfen, welche 
den^Extremitaten der Rumpfsegmente homolog sind, ist auch 
bei den iibrigen Tracheaten, sofern man die Antennen derselben 
als gleichwertige Bildungen durch die ganze Reihe hindurch 
auffast, nicht ausgemacht.” 
A considerable difficulty arises when we try to homologise 
the antennae of Insects with those of Peripatus. In the latter, 
as has just been said, these organs receive their nervous supply 
from the brain in front of the eyes. In Myriapods, according 
to Newport, the case is the same ; but in Hexapods the case 
seems to be different ; but careful study is yet needed to settle 
this point. In the embryo Hexapod the antennae rise from the 
posterior side of the procephalic lobes, and there appears to be 
much evidence that they are innervated from a distinct ganglion 
from that which supplies the eyes. On the other side, Ayres 
(’84 pi. 20, figs. 22 and 23) represents the antennal lobe in 
CEcanthus as being in front of the ocular lobe and between it 
and the origin of the nerves to the ocelli, a condition which 
needs confirmation. 
Should this view that the antennae of Peripatus and Hexapods 
are not homologous prove true it would throw considerable 
doubts upon the comparatively close relationship which has 
been supposed that they hold to each other, a relationship 
which may be doubted on several other grounds, some of which 
will be mentioned later. 
In the Spiders but one recent author (Croneberg, '80) has, 
so far as I am aware, found what he regards as antennae. He 
figures (pi. xvi, figs. 14 — 16) the embryo of Eendryphantes, 
showing the upper lip (rostrum) arising as two appendage-like 
