ALDIENTAEY CANAL IN LEPIDOSIREN AND PROTOPTEEUS. 505 
Text-fig. 10 a. Text-fig. 10 b. 
Text-figs. 10 a, b, o, i>. — Sections from the same series as that shown in 
text-fig !) to illustrate the changing relations of lung to gut as it passes 
backwards, a. Aorta, cjlom. Glomus. 1. Lung. n. Notochord, ces. (Eso- 
phagus. 
