THE DEVELOPMENT OF THE MIJLLERIAN DUCTS OF REPTILES. 



621 



Fig. 11. Transverse section through a crocodile embryo of about 20 mm., showing undermining of the 

 anterior lateral plate of thickened epithelium. 



Figs. 12, 13, and 14. Sections through embryo of Chelone of 21 mm., showing undermining of anterior 

 lateral plate. 



Fig. 15. Section through the same embryo, showing the ostium abdominale. 



Fig. 1 6. Section through Chelone embryo of 25 mm., showing the end of the Miillerian duct in close 

 proximity to the segmental duct. 



Fig. 17. Next section posterior to that shown in fig. 16, to show the segmental duct passing obliquely 

 behind the Miillerian duct. 



Fig. 18. Next section to that illustrated in fig. 17. The segmental duct is seen in the position occupied 

 further forward by the Miillerian duct. 



al.c. = alimentary canal. 



ao. = aorta. 



br. = bronchus. 



c. = ccelom. 



el). =notochord. 



r,.v. = cardinal vein. 



d. = diverticulum. 

 gl. = glomus. 



li. = liver. 



lu. = lung. 



m.d. = Miillerian duct or its foundation. 



ines. = mesonephros. 



re. = nephrostome. 



o. — ostium abd. tub. 



pr. = pronephros. 



;■ = remnant of lateral plate. 



s.d: = segmental duct. 



tr. = trachea. 



VOL. XXXIX. PART III. (NO. 23). 



5 B 



