DEVELOPMENT OF THE OVARIES IN THE BLOWFLY. 441 
(25) 
(26) 
in Monographien bearbeitet. Erste Monographic. Die weiblichen 
Geschlechtsorgane der Kafer. Berlin, 1847. 
Stuhlmann, F. — “ Die Reifung des Arthropodeneies naeh Beo- 
bachtungen an Insecten, Spinnen, Myriapoden und Peripatus.” 
Berichte der naturforseh. Gesellscbaft zu Freiburg, Bd. i. 1886. 
Weismann, A. — Die Entwicklung der Dipteren. Leipzig, 
1864. 
DESCRIPTION OF PLATE XXVIII. 
Figs. 1, 2, and 3. The uterus and its appendages in the adult egg-laying 
insect. The different parts are indicated by the same letters in all the 
figures. 
b. Bursa copulatrix. 
cl. Duct of the gum-gland. 
cjl. Gum-gland. 
m. Retractor muscle of oviduct. 
o. Ovary. 
od. Oviduct. 
os. Terminal enlargement of the oviduct. 
p. Uterine pouch. 
s. Spermatophorous capsule. 
ut. Uterus. 
v. Vagina. 
x. Attachment of the gum-gland to the ovary. 
Fig. 1. Dorsal view of the uterus. X 20. 
2. The same, with the ovaries. The parts rendered semitransparent 
with glycerine, and seen by transmitted light. X 10. 
3. A median section of the uterus in the vertical antero-posterior 
plane. 
4. The ovary of a three-day-old pupa, c, capsule ; cl, cells of the 
calix ; es, egg-strings. X 200. 
5. Two of the egg-follicles from a ten-day-old pupa, cl, calicine duct ; 
os, ovisac; st, stalk of egg-follicle of the ovary; Psy, pseudo- 
yelk-granules of the pupa; x, cell-mass to which the stalks of 
the ovisac are attached. X 300. 
6. An ovisac from a young fly. tc, terminal chamber; ec, egg- 
chamber ; si, stalk of ovarian follicle ; cl, calicine duct ; tr, 
trachea. X 200. 
7. Another ovisac from a young fly, a little more advanced, y, edge of 
epithelium of egg ; ec', ec", young egg-chambers. The other letters 
as in figs. 5 and 6. X 300. 
