OOGENESIS IN PHILOSAMIA ‘CYNTHIA 
PAULINE H. DEDERER 
From the Zoological Laboratory, Columbia University 
SIXTY-FOUR FIGURES (SIX PLATES) 
CONTENTS 
OOD e Pee kA a a eR te HR sc SRN. Cc 1 
PRS MT be MUU Tet arise, oat bie nc) gie's sae oan cle Sagebeelie ene mene ae Rebate ee 2 
Pearce GPA WAREOMINS Af thteidGin) ¢2< 5-2 <2 wa five 4 @ » -' oe « gnibla nocd eesti ara age meeps 3 
1 ISS EATS RR, oe re oe PR Bee WO ro ee} COL 3 
a.. Chromosomes in the embryo..........:.....2s.+< Be casio Sed Exar TNG 3 
ep nein LHC A DIO) GIVIGEOTK. so 5 0.5. 500 5. sod ba delete leirolg aimed 3 
Gy PSECU IMATUS SION GIMISION. .. 5556 .e es... . sz sinelae nis sam Sue © note miata 6 
ie Lo SS OT ee rrr! reir sor ee a 7 
Pomme MaMa ATC COMMATISODS)..< 5.05... ++ = +s 22s aistelcin « Hane REE LoiROg tenets 8 
LESS GREW ESSE ton ie She a eS 5 SINE Lo Cetra 10 
PIM Eyed AN EAS feces Ree Pe od oeshic scales ols Wg 3! 3 4 « «iahoce ciety 3 Fee ors ate 10 
a. Growth of the ovary: General description. ...\..- 02... ./muanee+ owas 10 
b. Early stages in the development of the ovary............... 20.2005: 11 
Cueevelopment Guiairse Gls... ic 05 6s. . o4« 2+ 5:0'5enteeneremale opeteelenens ate eee 13 
Gee velopmenh Miveee COMB: ccc... 2s sees soy gee Sotto emer colorants 17 
e. Degenerating cells in the ovary...................- Ka 2 0 epee 20 
es Abnormal nuclei in the early ovary...................0. Sy SDS 20 
SAC OAC MIRIONS ANG COMIPATISONS):.\. 0.5/5.0 «os oa s 4g epatebe phove'a 0 ons toe altri 20 
3. Literature on the early development of eggs and nurse cells........... 22 
SAT AR OR dS pe ee MAL Stench SSG se ees) 
RAO tie O eee AI cia. Sian cola) 2 dee 0) ayn esi n.n 6 + Seve alm iw hain eee tel apelin delat emtsie ts 27 
INTRODUCTION 
From the standpoint of sex production the Lepidoptera are 
of especial interest as compared with other insects, because 
the experimental evidence of Doncaster (’06, 08) and Raynor 
(06), Punnett and Bateson (’08) seems to demand the assump- 
tion that there dre two kinds of eggs in the moth. The absence 
of visible dimorphism in the spermatozoa of the Lepidoptera 
also lends probability to this hypothesis. In other groups of 
insects studied, the spermatozoa are often dimorphic. The 
eggs have been assumed to be all alike, and this condition has 
1 
JOURNAL OF MORPHOLOGY, VOL. 26, No. 1 
MARCH, 1915 
