666 THE GENERATIVE ORGANS. 
2. DESCRIPTIVE ANATOMY OF THE INTERNAL GENERATIVE 
ORGANS OF THE FEMALE BLOW-FLY. 
The internal generative organs in the female Blow-fly are a 
pair of ovaries and a pair of parovaria; the oviducts, the 
utero-vaginal tube and its appendages the spermatophorous 
sacs, which are three in number. 
The Ovaries.—In the egg-laying female of the Blow-fly the 
ovaries are'a pair of discoid organs, which occupy the greater 
part of the abdominal cavity and distend it so that its ventral 
syndesmoses are extended to their full extent. 
Each ovary is oval in form, concave on its dorsal and 
internal, and convex on its ventral and external surfaces ; 
3°5 mm. in its long diameter, 3" mm. in its transverse diameter, 
and 1°5 mm. thick. 
These organs are so situated that they are only separated 
from the ventral and lateral walls of the apex of the abdomen 
by a layer of adipose tissue *75 mm. thick. They meet in the 
middle line beneath the oviducts and intestine, and extend to 
the margins of the pericardial septum dorsally. They extend 
forwards to the crop and the great air-sacs at the base of the 
abdomen. 
Structure of the Ovary.—Each ovary is enclosed in a thin 
capsule of peritoneal tissue, which covers the whole gland and 
is continuous with the peritoneal coat of the oviduct. 
This capsule encloses the egg-tubes, of which there are from 
eighty to one hundred, and sends incomplete septa between 
them, thus dividing the cavity into as many loculi as there are 
egg-tubes. 
The oviduct terminates in a pair of tubz, the tubz of the 
oviduct, which are short and funnel-shaped. 
One of these tube is connected with each ovary ; it is united 
Description OF PLarE XLVII. 
The internal generative organs of the female Blow-fly. /, fat bodies; 0, ovary ; od, 
oviduct ; ~, parovarium; ¢, tuba; s, sacculus ; #, uterus ; and v, vagina. The 
three ovoid bodies between the parovaria and the uterus are the spermathece. 
