PLATE 3 



EXPLANATION OF FIGURES 



13 Sphenopalatine ganglion reconstructed from several sagittal sections 

 of advanced embryo of Chelydra. X 65. 



14 Diagrammatic reconstruction showing topographical relationships of 

 ciliary and sphenopalatine ganglia to cranial nerves, embryo of Chelydra 13 mm. 

 in length. 



15 Sagittal section through sphenopalatine ganglion, embryo of Chelydra 

 14 mm. in length. 



16 Sagittal section through otic ganglion, 156 hour embryo of chick. X 75. 



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