296 Eobert Willi elm Hegner. 



EXPLANATION OF PLATES. 



Reference Letters, 

 am., amnion, 

 am.s., amnioserosal fold, 

 ap., appendage, 

 bl., blastoderm. 

 bl.c, blastoderm-cell, 

 bl.c.n., blastoderm-cell nucleus. 

 eh., chorion, 

 coe., coelomic cavity. 

 d.v., disintegrating yolk-globule, 

 ec, ectoderm. 



e.m.i., epithelium of mid-intestine, 

 f.b., fat-body, 

 g.bd., germ-band, 

 g.c, germ-cell, 

 g.gl., germ-gland. 

 K.h.bl., "Keimhautblastem." 

 l.f., lateral fold of ventral groove, 

 mp.t., Malpighian tubule, 

 ms., mesoderm, 

 m.t., muscular tissue. 

 U.S., nervous system, 

 p.am.c, posterior amniotic cavity, 

 p.bl.n., preblastodei'm nucleus, 

 p.c, pole-cell, 

 p.c.c. pole-cell canal, 

 p.c.n., pole-cell nucleus, 

 p.d., poie-disc 

 p.d.g., pole disc granule, 

 ps.bl.n., pseudo-blastodermic nucleus, 

 s.m., splanchnic mesoderm, 

 so.m., somatic mesoderm, 

 sr., serosa. 



t.f., terminal filament, 

 tr., tracheal invagination. 

 v., yolk. 

 vac, vacuole. 



vac.st., vacuolated stratum of the "Keimhautblastem." 

 vit, vitellophag. 

 vt. g., ventral groove. 



