76 J. T. CUNNINGHAM. 



vitelline membrane, corresponding to the pits. g. v. The germinal vesicle. 

 Magnified 50 diam. 



Fig. 4«. — Follicular epithelium and vitelline membrane, as seen in a section 

 of same series as Fig. 4, to show the canals in the vitelline membrane. Mag- 

 nified 350 diam. 



Fig. 5. — Yolk-elements from ovarian egg in fresh condition, a. "Vitelline 

 discs contained in spherical capsules. /3. Similar discs free. y. Spherical 

 bodies, probably composed of fat. 



I'iG. 6. — Portion of ovary of young Myxine 6 inches long, stained with 

 borax-carmine, x. The free, y. the attached border. Magnified 100 diam. 



Fig. 7. — Stained preparation from testis of immature male Myxine. ca. 

 Capsules full of nucleated cells (spermatoblasts), me. Mesorchium. hi. 

 Blood-vessels. Magnified 50 diam. 



Fig. 8. — Section of testis from same specimen as Fig. 7. The plane of the 

 section is perpendicular to the thickened border of the testis, ca. Capsules. 

 me. Mesorchium. co. Connective tissue. Magnified 70 diam. 



Fig. 9. — Spermatoblasts of immature male Myxine, as seen in the fresh 

 state after escape from the ruptured testicular capsules. Magnified 280 

 diam. 



Fig. 10. — Section of testicular portion of reproductive organ of immature 

 hermaphrodite Myxine. ca. and co. as in Fig. 8. Magnified 100 diam. 



Fig. 11. — Ovarian ovum of Myxine contained in its follicle, having a pro- 

 jection at each pole caused by the development of the polar processes of the 

 vitelline membrane. Natural size. 



Fig. 12. — Section through the protoplasmic pole of an ovum, similar to 

 that shown in Fig. 11. a, b, c, d, g. v., p., as in Fig. 4. Magnified 35 diam. 



Fig. 13. — Section through protoplasmic pole of young ovarian ovum of 

 Myxine. Length of ovum, 11 mm. «, b, c, d, g. v., as in Fig. 12. Magnified 

 50 diam. 



Fig. 13 a. — Follicular epithelium and neighbouring parts from same section 

 as Fig. 13. a, b, d, as before. Magnified 200 diam. 



Fig. 14. — Spermatozoa, and stages of spermatogenesis, from testicular por- 

 tion of reproductive organ in a hermaphrodite Myxine. Magnified 250 diam. 



