ON THE AGAMIC REPRODUCTION AND MORPHOLOGY OF APHIS 45 
pl. 7, figs. 1, 2, 4, 5), reminds one strongly of the envelope of the 
appendage in Aphes. 
The micropyles of Lebel/ula, Dexia, and A/usca, again, exhibit a 
sort of “mouthpiece” formed by a prolongation of the chorion 
surrounding the micropylar aperture. 
The account which I have given of the reproductive organs of the 
oviparous Aphis is in general agreement with that of other observers. 
Morren describes the reproductive organ of the wingless oviparous 
female of A. Perstce thus :— 
“The ovigerous ceca well deserved their name; for no foetuses 
were any longer visible in them. Each was exactly composed of 
three chambers, of which the first or terminal was enlarged and 
spherical, and filled with twelve to twenty-four little well-formed ova, 
yellow in the centre, and white peripherally. These ova descended 
into the second chamber, and then elongated and enlarged; but in 
general they acquired their hard covering only in the third or last 
chamber, which in all the females was occupied by a very large ovoid 
greenish ovum. These ova became covered at the same time with 
the sebific liquid; for some were seen to be provided with a little 
appendage intended to fix them to the bodies in which the parent 
lays them. This appendage was mucous, and arose from a thickened 
viscous liquid.” (Z ¢. p. 89.) 
I recognize in Morren’s “twelve to twenty-four ova” the ovarian 
glands which I have described. His microscope was obviously in- 
adequate to show him the true ova; but it seems difficult to suppose 
that in this species there is, as he maintains, neither colleterial glands 
nor spermatheca. His objection to Dutrochet’s statements appears 
to me to be well founded, for Dutrochet examined a viviparous 
female; but I strongly suspect that he has himself overlooked the 
“ sebific” apparatus in the oviparous forms. 
Von Siebold states that the ovarian ceca of the oviparous Aphzs 
Lonicere are divided into only two chambers :— 
“In the undeveloped state the whole tube forms only a simple 
pyriform appendage of the oviduct ; but as development proceeds, 
the upper globular chamber becomes by degrees separated by a 
constriction, and at the same time a great difference makes its 
appearance between the upper and the lower chambers: for the lower 
chamber contains a finely granular mass which gradually becomes 
modelled into an oval egg; the upper chamber, on the other hand, is 
filled with vesicular bodies, in which smaller vesicles containing a 
nucleus are distinguishable. If these bodies are to be regarded as 
germs of ova (Wollte man diese blasenformigen Kérper als Eier- 
