Development of the Digestive Canal of the American Alligator

by A. M. Reese

Fig. 3a.	Fig. 3b.
4
Fig. 3c.	Fig. 3d.
A series of transverse sections through an embryo of the stage of the one shown in figure 3. × 43.

Fig. 4. A surface view of an embryo
with about twenty pairs of somites. × (about) 15.

Fig. 4a.	Fig. 4b.
Fig. 4c.	Fig. 4d.
A series of transverse sections through the anterior end of an embryo of the approximate age of the one shown in figure 4. × 20.
Fig. 4e.	Fig. 4f.
Two transverse sections through the thyroid gland of this stage; more highly magnified. × 102.

Fig. 4g.	Fig. 4h.	Fig. 4k.
Fig. 4i.
Fig. 4j.	Fig. 4l.	Fig. 4m.
A series of transverse sections caudad to the preceding. Figure 4H, × 43; other figures,× 20.

Fig. 5. A surface view, in profile, of an embryo
at the time of the origin of the limbs. × (about) 5.

Fig. 5a.	Fig. 5b.	Fig. 5c.
8
Fig. 5d.	Fig. 5e.	Fig. 5f.
Fig. 5g.	Fig. 5h.	Fig. 5i.
A series of transverse sections through an embryo of the age shown in figure 5. × 7.