2 1 2 MUNSON. 



EXPLANATION OF PLATE XIV. 



Fig. 19. An egg showing an inner granular zone of the cytoplasm, and its 

 connection with the stalk of the egg. The usual chromatin network of the ger- 

 minal vesicle is wanting. No nucleolus is present. The tunica propria forming 

 the basement membrane of the epithelium and the outer boundary of the stalk of 

 the egg is continuous with the investing membrane of the egg ; m.c, muscle coat; 

 t.p., tunica propria ; v.z., internal yolk zone. 



Fig. 20. An egg showing a hyaline inner yolk zone which is extended towards 

 the point of attachment of the egg. 



Fig. 21. An egg showing an inner yolk zone, j.s., surrounding the germinal 

 vesicle ; in the dividing line between the inner and outer zone, the vitelline-body, 

 v.b., surrounded by a modified polar mitosome. 



Fig. 22. The pro.\imal portion of an egg showing the accumulation of yolk 

 secretion, y.s., at the base of the stalk of the egg, and the formation of the first 

 layer of the egg membrane. 



Fig. 23. An empty follicle serving as a yolk gland, showing the secretion 

 products obscuring nuclei and cell boundaries; s.g., secretion granules; m.c., 

 muscle coat. 



Fig. 24. An egg showing an internal, hyaline protoplasmic zone surrounding 

 the germinal vesicle as a uniform ring, i.z.\ the germinal vesicle with diverticula 

 and the nucleolus containing a vacuole. 



Fig. 25. An egg showing the peripheral bodies,/.^., and their gradual fusion 

 into the first layer of the egg membrane or chorion, ch. Low magnifying power. 



Fig. 26. Small egg with a germinal vesicle containing two " Hauptnucleoli," 

 h.n., each extruding a " Nebennucleolus," n.n. 



Fig. 27. The proximal portion of an egg, showing deeply stainable bodies 

 resembling nuclei — the yolk-nucleus, /.«. The basement membrane of the stalk 

 of the egg is seen to be continuous with the primary egg-tunic, /./. 



Fig. 2S. Tangential section of an egg, showing the form and distribution of 

 the peripheral bodies, p.b., and the round bright dots or pores with which they are 

 pierced. 



Fig. 29. Small egg showing the internal granular zone, y.z., in the form of a 

 ring surrounding the germinal vesicle, the latter containing no true chromatin 

 reticulum and no nucleolus. 



Fig. 30. An egg in the third stage, filled with nuclei, and partly surrounded 

 by nucleated granular cells; no germinal vesicle. 



Fig. 31. An egg (similar to Fig. 30) undergoing regressive metamorphosis ; 

 no germinal vesicle ; pro.ximal portion of the yolk filled with nuclei and a hyaline 

 protoplasm ; egg surrounded by a false follicle epithelium of granular cells, as in 

 Fig. 30 ; chorion folded, distorted, and pierced in various ways. 



Fig. 32. A small egg of an adult ovary (magnified y'j oil immersion), showing 

 a very distinct cytoreticulum, and a sphere in the form of a central dense network 

 with very distinct radial fibers, many of which appear to be continuous with the 

 general cytoreticulum ; the cytoreticulum apparently continuous with the nuclear 

 network ; metaplasm (archoplasm) scant or absent. 



Fig. 33. Section of an ovarian tube of a young Limulus (Leitz, oc. i, obj. 7), 

 showing a group of cells undergoing the preliminary phases of karyokinesis pre- 

 vious to the formation of a growing oocyte. 



