346 AXNALS NEW YORK ACADEMY OF SCIENCES 



Annotations of Leaders on all Plates 



1. Optic sulcus or vesicle. 



2. Tubercle of the floor. 



5. Quintal sulcus or ganglion. 



Sa. Profundus ganglion. 



Jf. Acoustico-facial sulcus or ganglion. » 



5. Medullary plate or medullary fold. 



6". rrimitive groove. 



7. Somatic ectoderm. 



8. Anterior neuropore or its vestige. 



9. Quintal hiatus. 



10. Acoustico-facial hiatus. 



11. Other hiatus in line of closure. 



12. First ganglionic segment. 



12a. First ganglionic segment ; its cephalic portion. 

 121). First ganglionic segment; its caudal portion. 



13. Second ganglionic segment. 



13a. Second ganglionic segment ; its cephalic portion. 



13b. Second ganglionic segment ; its caudal portion. 



14. Third ganglionic segment. 



15. Mesencephalon. 



16. Thalamencephalon. 



17. Mammillary region. 



18. Infundibular region. 



19. Telencephalon. 



20. Ganglionic crest. 



21. Rhomboid fossa. 



22. Anterior isthmian sulcus. 



23. Posterior isthmian sulcus. 



24. First myelomere. 



26. A'elum transversum. 



27. Excrescence associated with vestige of anterior neuropore. 



28. Region of transition between somatic ectoderm and neuraxis. 



29. Mesoderm. 

 SO. Entoderm. 



31. Preganglionic segment of deuterencephalon. 



