The Development of the Ovary and Ovarian 
Egg of a Mosquito, Anopheles maculi- 
pennis, Meig. 
By 
A. J. Nicholson. M.Se. ‘B’ham.). 
" (From the Zoological Laboratory of the University of Birmingham.) 
With Plates 17-20. 
CONTENTS. 
: PAGE 
INTRODUCTION . 2 a Sage ; 5 : ; ‘ : . 9396 
MATERIAL AND METHODS. : 397 
HIBERNATING MosqQuirogs AND FIRST Peo or Ree Seo 399 
FEMALE GENITAL ORGANS . : i : ' eu 40) 
GENERAL Lines Of DEVELOPMENT OF ee AND ingen : . 405 
ANATOMY OF THE MaturE Kee . ‘ : 2 A407 
DIFFERENTIATION OF GERM-CELLS AND FIRST peulob OF chore OF 
THE EG@G-FOLLICLES F 3 ; 4 » 412 
Srconp PERIOD OF GROWTH OF THE ee FOLLICLES ‘ , . 417 
I. Branching of the Oocyte Nucleus and Segregation of Vegeta- 
tive and Germinal Parts ? : . 418 
If. Yolk Formation and the Nutrition of the Gee bs 422 
III. Discussion concerning the Oocyte Nucleus and N tien 
of the Oocyte in A. maculipennis . ; 5 . 425 
IV. Development of the Outer Wall : 3 : : . 435 
V. Development of the Micropyle Apparatus . ‘ ; . 436 
VI. Development of the Inner Wall . : : é : . 439 
DEGENERATING EGG-FOLLICLES  . : : 3 . 440 
PRESENCE OF SPOROZOA AND BACTERIA IN fee FOLLICLES . . 441 
SUMMARY . , i F : : i ; , ; . 442 
List or LITERATURE . J ‘ : F : . P . 444 
EXPLANATION OF PLATES . . . : : : : . 446 
