136 BYRNES. 
EXPLANATION OF PLATE X. 
(All drawings made with the camera excepting Fig. 17.) 
Fic. 1. Cross-section of young Amblystoma. Section taken through anterior 
limb-region, showing beginning of ventral myotome-process, somatopleuric fold of 
anterior limb, and 2d pronephric funnel. 
Fic. 2. Cross-section older larva just behind anterior limb-rudiment. 
Fic. 3. Cross-section older larva through anterior limb. 
Fic. 4. Cross-section through anterior limb posterior to 2d pronephric funnel. 
Fic. 5. Like Fig. 4. Shows myotome-process distinct from limb-rudiment. 
Fics. 6 and 7. Cross-sections through anterior limb-regions of older larvae. 
Myotome-process seen to median side of limb-rudiment. Connection lost between 
myotome and ventral myotome-process. 
Fic. 8. Cross-section in front of posterior limb-region in Amblystoma. 
Fic. 9. Cross-section behind posterior limb-region. 
Fic. 10. Whole cross-section of Amblystoma through anterior limb-region, 
showing regions indicated in Figs. 1-8. 
Fic. 11. Cross-section through anterior limb-region of Triton. 
Fic. 12. Longitudinal section through posterior limb-region of Rana. Section 
shows abdominal muscle-rudiment passing the limb-rudiment. 
Fic. 13. Cross-section through the posterior limb-region of Amblystoma. 
_ Fic. 14. Cross-section through the posterior limb-region of Triton. 
' Fic. 15. Cross-section anterior to posterior limb-region of Triton. Shows 
rudimentary abdominal muscle at ventral edge of myotome. 
Fic. 16. Whole cross-section of Amblystoma through posterior limb-region, 
showing regions indicated in Fig. 13. 
Fic. 17. Whole preparation of anterior limb-region of Amblystoma. 
Fic. 18. Cross-section through posterior limb-region of Rana. (Cf Fig. 18 
with Fig. 12.) 
