586 MR. A. M. ALTSON ON THlil 
The ovary of an immatm-e female examined consisted of onlj^ ten ovarian 
tubes (text-fig. 2, A), the other four eventually arising from the apex of the 
calyx and between the existing tubes. The ovary of a mature unfertilized 
female (text-fig. 2, B) shows a considerable enlargement of the calyx, which 
is tightly packed with ripe eggs. 
From the calices the eggs pass along short oviducts into a double-chambered 
valve [vl]. Each chamber of the valve is lined with brown chitinized setse * 
with their free ends lying in the same direction as that in which the eggs 
pass (vl, PI. 32. fig. ■#). The chambers of the valve meet to form the 
commencement of the common oviduct, and the seta3 terminate some distance 
before a valvular duct (vt) leading into the spermatheca enters the common 
oviduct. 
The spermatheca is very large and terminates in a single tube — the 
spermathecal or accessory gland. In fertilized females the size of the 
spermatheca is pei'ceptibly increased. Inside the spermatheca, arising from 
the ventro-lateral surface at the point (psp) \'ihere it narrows, are found a 
series of 27 chitinized seta3 (s, PI. 32. fig. 3) ; their function is obscure. 
The spermatozoa are mostly in packets — spermatophores (spp, PI. 32. fig. 4), 
— but a considerable number are found loose in the fluid contents of the 
spermatheca. 
The common oviduct, into which the eggs pass from the valves, is of 
muscular structure, and finally disappears into the " ovipositor." 
The long flexible cloacal stalk {Ir, PI. 32. fig. 2) arises from a point in the 
centre and near the base of the ventral pygidial plate {vj}). The stalk 
extends through the middle of the abdomen into the meta-thorax to a point 
beyond the beginning of the "ovipositor," where its apex enlarges into a 
knob from which two sets of muscle-fibres (w\ m^) arise. The m^ set of 
muscles consists of series of bundles of long fibres grouped around the 
" ovipositor," and extending from the apex of the cloacal stalk to a point 
between the short rods («>•), where they are attached to the outer sheath (ots). 
The m^ muscles surround the cloacal stalk to its base, where it is embedded 
in a mass of muscles. In addition to the muscles (m^, m^), there is another 
series {m^), which arise around the beginning of the " ovipositor " and com- 
pletely surround the outer sheath, extending for about half its length, at 
which point they are attached to it. Further, there are numerous muscle- 
fibres arising from the same point as the (m^) muscles ; these are found 
longitudinally ti-aversing the inside of the inner sheath (?««) of the "ovi- 
positor " (PI. 34. figs. 4-7). And, in addition, tliere is a series of cancellate 
muscles lining the walls of the distal portion of the " ovipositor,'" apparently 
* lu a previous jjaper, "On the Method of Oviposition and the Egg of Lyctus bninneus 
)Steph." (.Tourn. I,iini. Soc, Zool. xxxv. 192.3, p. 217), the writer has stated that it is tliese 
setDs-lined valves wliieh impart the striations and process to the deposited eggs. 
