188 LIVERPOOL BIOLOGICAL SOCIETY. 
called ‘‘ vagina’), a copulatory pouch, and three sper- 
mathece. 
The median oviduct begins during the larval period, as 
an invagination of the body-wall in the region which I 
take to correspond to the junction of the eighth and ninth 
sterna. At the commencement of pupal life (fig. 7) it al- 
ready extends forwards to the anterior end of the eighth 
segment, and during pupal life it continues to advance till 
it reaches to the middle of the seventh segment, all this 
time keeping pace with the forward movement of the 
fused seventh and eighth abdominal ganglia, the anterior 
end always lying beneath the hinder end of this mass. 
The sudden forward movement of the mass into the sixth 
segment at the time of escape of the imago however leaves 
it behind. 
The copulatory pouch is a small upward and backward 
diverticulum of the hinder end of the median oviduct. 
Three flattened forward outgrowths from it le upon the 
median oviduct, in the hinder half of segment VIII. at the 
commencement of pupal life. During this period they be- 
come longer and narrower and folded upon themselves, - 
and their anterior ends become dilated to form hollow 
spheres lined with a thick rigid layer of chitin! These 
three bodies are the ‘‘ spermathece’’—how the seminal 
fluid can be forced into them and injected from them is, 
to me, a mystery. 
The male organs are the testes and anterior part of the 
vasa deferentia already mentioned, the hinder portions of 
the vasa deferentia, the “‘ prostatic” glands, the copulatory 
organ, and a common pouch at its base mto which the 
vasa deferentia and the prostatic glands open. 
The testes are chambered organs, the spermatozoa in 
the hinder chambers being more advanced in development 
than those in the anterior ones, and these hinder chambers 
