42 ON THE AGAMIC REPRODUCTION AND MORPHOLOGY OF APHIS 
are not always to be seen with ease; and if the epithelium of the 
lower part of the apical chamber has become much altered, they 
cannot be detected: for they are visible exclusively in this part of 
the chamber, of whose epithelial cells they are, as I believe, merely a 
modification. However this may be, germinal vesicles and spots of 
all sizes intermediate between that of the ovum of the second 
chamber and that of an ordinary epithelial cell are seen in close 
contact with the parietes of the chamber. I have detected as many 
as six in this position. When the chamber is subjected to com- 
pression they may be set free, and are then seen to be surrounded 
by a zone of clear substance, the rudimentary vitellus. Under 
similar circumstances, the “glandular bodies” may also be isolated ; 
when they present themselves as vesicles surrounded by a clear 
homogeneous substance, which is frequently prolonged at their apical 
extremity. It is gradually dissipated, and the inner sac set free by 
the action of water. 
I have not seen any ovarian ligament in the oviparous Apfzs. 
The structure which I have described was wholly unexpected and 
new to me; and I am not aware that anything similar has yet been 
noticed in the ovaria of Insects. I am inclined to believe that the 
glandular bodies contribute directly to the formation of the vitellus, 
because I have more than once seen cases, like that figured in Pl. XL. 
[Plate 5] fig. 3, where the clear cord-like body appeared to pass 
directly into the mass of the ovum. There was always a widely 
open communication between the first and second, and between the 
second and third chamber; but the passage between the third and 
fourth was closed by the meeting of the epithelial lining. Does each 
ovum, as it is given off from the ovary, and passes backwards, carry 
with it a gelatinous mass, the product of one half of the glandular 
bodies, and only cease to be connected with these glands when it has 
taken the third place? 
Three caca open into the dorsal side of the lower part of the 
vagina; of these the anterior single one is the spermatheca; the 
posterior pair are the colleterial glands (Pl. XL. [Plate 5] fig. 1, 
Ml, 72). ; 
The spermatheca (7) is a sac with a narrow neck, dilated at its 
extremity, which opens considerably in advance of the colleterial 
glands, while its enlarged end lies between them. The duct of the 
* Unless, as I am strongly inclined to suspect from Leydig’s description, and from a hasty 
examination on my own part of the ovaria of Cocews, the corresponding chamber of that 
insect’s remarkable ovaria presents a similar structure. (See, however, the note which 
concludes this paper.) 
