Mark. - Lepidosteus. 



ABBREVIATIONS. 



cap. Head of villus. pd. Stalk of villus. 



c.-t. cp. Connective-tissue corpuscle, rx. Root of villus. 



Jus. mat. Maturation spindle. st. vil. Villous layer of egg membrane. 



gran. Granulosa. th.fol. Membrana propria of theca folliculi. 



m py. can. Micropylar canal. vac. Vacuole. 



m py. cl. Micropylar cell. vit. Vitellus. 



nl. Nucleus. vs. g. Germinative vesicle. 



nl. gran. Nucleus of granulosa cell. z. r. Zona, radiata. 



PLATE V. 



Fig. 1. Radial section through germinative vesicle and micropylar funnel. Ow- 

 ing to a distortion of the section, the curvature of the part of the 

 membrane shown is less than it should be. The finely granular and 

 vacuolated portion of the yolk (vac.) beneath the germinative vesicle 

 is in the centre of the egg. The egg was from an ovary which was 

 hardened in 0.25 per cent chromic acid and stained in alcoholic borax- 

 carmine. X 72. 



" 2. The section following that shown in Figure 1, more highly magnified. 

 X 335. 



" 3. Radial section through villi and granulosa of an ovarian egg preserved in 

 alcohol and stained in alcoholic borax-carmine. X 515. 



° 4. Surface view of a portion of the granulosa from the same egg as that of 

 Figure 3. X 515. 



