ON THE AGAMIC REPRODUCTION AND MORPHOLOGY OF APHIS 41 
vesicle and spot of its rudimentary ovum can be easily seen; and 
but very few fine granules are deposited in the substance which will 
eventually form the yelk. 
“\ clear cord-like mass (g), commonly divided longitudinally, so as 
to appear double, traverses this chamber, and can be traced into the 
next. 
The apical chamber (K) is as large as the third, but is longer 
transversely than longitudinally, while the reverse is the case with 
the third chamber. Its outer wall is formed by a continuation of the 
same structureless membrane as that which constitutes the rest of 
the cecum. The epithelium (/), which is particularly thick in the 
upper part of the second chamber, especially at the neck or con- 
striction between the first and second, is suddenly attenuated as it 
spreads on the inner face of the wall of this chamber, and becomes 
very thin from the flattening of its cells. From having the characters 
of a cylinder-, it takes those of a pavement-epithelium. 
It is at first extremely difficult to understand the nature of the 
contents of the apical chamber. All its anterior part appears to be 
filled with about a dozen closely appressed bodies (/), which, if 
examined without due attention, or under a low power only, may 
easily be confounded with ova. Each of these bodies has a sort of 
wedge shape, such as would result from the compression of rounded 
masses in a spherical envelope which they nearly fll. Its apex is 
turned inwards; its base outwards. Each consists of a thick trans- 
parent outer coat closely investing a denser and well-defined mem- 
branous sac. The latter contains a clear substance, in which many 
irregular granules are embedded. The lines of separation between 
the appressed sides of these bodies are well seen, either in a sectional 
or a superficial view. In the latter case, they appear as polygonal 
meshes; in the former, as lines separating the bodies from one 
another, and bounding their curved bases on the side of the epi- 
thelium. On tracing the lines of separation towards the central 
interval between the ends of these bodies, they become lost, and a 
mere clear, homogeneous substance seems to occupy the whole central 
part of the chamber; but on carrying the eye backwards, this clear 
mass is seen to be continuous with the two cords which I have above 
described as entering the second chamber (PI. XL. [Plate 5] fig. 3). 
The histological constitution of these bodies is at once sufficient 
to convince the observer that they are not ova, and I regard them as 
glandular masses which secrete the matter of the clear cord-like 
bodies which descend into the second and third chamber. 
The ova themselves, or rather the rudiments of the future ova, 
