iQio] The Egg of the Walking Stick 87 



is slightly elevated and buff-colored (Figs, i and 8, m). At the 

 posterior end, this margin narrows enclosing a semicircle (Figs. 

 I and 8, s) within which lies the micropylar orifice (Figs, i and 

 8, 0). The margin of this sepii-circular area is in continuation 

 with a ridge which extends towards the posterior pole of the egg. 

 The buff-colored ridge joins a triangular extension of the black 

 region of the egg (Fig. i , r) and gradually disappears as it passes 

 posteriorly into the surrounding black surface. Within the 

 slightly elevated buft'-colored margin is a white convex region 

 which terminates at the posterior end in the microypylar orifice, 

 where the white color gives way to black (Figs, i and 8, 0). 



Mycropylar Apparatits: Muller (13) did not understand how 

 eggs of insects with a hard chorion were fertilized and he takes 

 an extreme view as to the way this phenomenon takes place 

 in the eggs of the Phasmidae. ' ' Bei den Phasmen hat die Samen- 

 kapsel ausser ihrer einen Oeft'nung nach aussen keinen beson- 

 dern Ausfiihrungsgang. Aber der Eingang der zweihornigen 

 Samenkapsel liegt gerade iiber dem langHchen Ausgang des Eier- 

 gangs. Der Samen tritt also aus der Eingangsoffnung der Kap- 

 sel unmittelbar in der Mundung des Eierganges ein, um sofort 

 zu den Eierleitern und Trompeten zu gelangen." 



"Wir haben aber bewiesen, das eine Befruchtung der Phas- 

 meneier nicht anders, als vor ihrer Ausbildung und namentlich 

 vor der Ausbildung der Schale, moglich sey." 



The micropylar apparatus is very remarkable and differs 

 from any of those which Leuckart (10) has described for so many 

 insect eggs. As already mentioned the micropylar orifice is 

 found at the posterior end of the convex area, just within the 

 space enclosed by the semicircular chitinous thickening of the 

 margin. This opening leads into a small canal, the micropylar 

 canal, which passes a short distance towards the anterior pole of 

 the egg. The micropylar canal is elliptical in cross section and 

 surrounded by extremely thick chitin (Fig. 5, g). When the 

 •inner surface of the "hilar area" in the region of the micropylar 

 apparatus is examined under a microscope, an invagination of 

 the inner surface of the chorion is readily seen; at the bottom 

 of ^ this inpushing is the opening of the micropylar canal 

 (Figs. 6 and 8, i). If the vitelline membrane in this region is 

 now examined under a binocular, one finds that a small, obliquely- 

 inclined, membranous tube has been torn away from the opening 

 of the canal (Fig. 2, /). A glance at Fig. 7, v, shows the opening 



