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ALBERT KUNTZ 



the aggregates of sympathetic cells associated with the rectum 

 in embrj'os of reptiles. In view of the probable phylogenetic 

 relationship which has already been pointed out between the 



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.-i*r5 





Fig. 9 Diagrammatic transverse section through the iliac arteries and the rec- 

 tum in a wenty-day embryo of Thalassochelys caretta. I. A., iliac arteries; Mes., 

 mesentery; R., rectum; S.C.G., sympathetic cell-aggregate dorsal to the mesen- 

 tery; S.C.R., sympathetic cells associated with the rectum. Sy., anlage of sym- 

 pathetic trunks; P.V., anlage of prevertebral plexus. 



sympathetic nervous system in reptiles and in birds, it is 

 highly probable that the sympathetic cell-aggregates associated 

 with the rectum in turtles are not far removed from the ances- 



