250 ALBERT KyNTZ 



cervical ganglion may enter the path of the great superficial 

 petrosal nerve in association with these fibers. However, the ma- 

 jority of the cells which advance peripherally along this nerve 

 obviously w^ander out from the geniculate ganglion. Some of 

 these cells become aggregated in the path of the nerve and give 

 rise to the anlage of the sphenopalatine ganglion. Cells of nerv- 

 ous origin also advance peripherally from the Gasserian ganglion 

 along the maxillary nerve. Many of these cells, doubtless, 

 wander out along the branches of the maxillary nerve and enter 

 the sphenopalatine ganglion. This ganglion, therefore, arises 

 primarily from cells which advance peripherally from the genicu- 

 late ganglion along the great superficial petrosal nerve, but re- 

 ceives cells also which advance peripherally from the Gasserian 

 ganglion along the maxillary division of the trigeminal nerve. 



In advanced embryos of Chelydra, the anlage of the sphenopala- 

 tine ganglion is relatively large and irregular in outline. It re- 

 tains an intimate relationship with the great superficial petrosal 

 nerve and remains connected with the maxillary nerve by rela- 

 tively slender rami. From the distal aspect of the sphenopala- 

 tine ganglion, slender nerves may be traced toward the olfactory 

 epithelium. Figure 13, illustrating the relationships of the sphe- 

 nopalatine ganglion to the maxillary and the great superficial 

 petrosal nerves in an advanced embryo of Chelydra, is recon- 

 structed from several sagittal sections. 



Other ganglia 



No trace of a ganglion homologous with the otic ganglion, so 

 well developed in mammals, was observed in embryos of either 

 Thalassochelys or Chelydra. Small aggregates of cells obviously 

 of nervous origin were observed, in a few instances, in embryos 

 of Chelydra, in the maxillary region, associated with the mandib- 

 ular division of the trigeminal nerve. The destiny of these cells 

 could not be deternimed. In no instance, however, was an aggre- 

 gate of cells observed, in embryos of the turtle, which could be 

 interpreted as the anlage of a submaxillary ganglion. 



