DEVELOPMENT OF AMPHIUEA SQUAMATA. 153 



Figs. 16a, b. — Two sections from same series as Fig. 1, but magnifled 340 

 diameters. 16a is through the genital rachis ; 16b througli the incipient 

 ovary. 



Fig. 17- — Shows young ovary passing into the genital rachis, from same 

 series as Fig. 14. 



Fig. 18.— Adult ovary. 



Fig. 19. — First rudiment of genital bursa. From an individual '62 mm. in 

 diameter. Osmic alone. 



Fig. 20. — More advanced stage of the bursa, w. v. b. lladial water vessel. 



Fig. 21. — Section of radial nerve -cord of young adult, w. v. b. Radial 

 water vessel. 



Fig. 22. — Section of radial uerve-cord of another adult, w. v. b. Radial 

 water vessel. 



Fig. 23. — Section of radial nerve-cord of adult treated with osmic alone. 

 w. V. b. Radial water vessel. 



