FIGURES 62 AND 63 



62 Same, section 13. 



63 Transverse section of left lower cervical region in a 13 mm. cat embryo 

 (series 92, slide X, section 27), X 22.5. 



1 Sympathetic nerve. 



8 Oesophagus. 



11 Jugular Ij^mph sac. 



13 Jugular lymph sac, jugular approach. 



14 Jugular lymph sac, subclavian approach. 

 16 Dorso-medial somatic venous tributaries. 



21 Thymus. 



22 Vagus. 



23 Left carotid artery, 



24 Thyrocervical artery. 



25 Internal jugular vein. 



26 Conniion jugular vein. 



29 Jugulo-subchivian trunk. 



30 Si.xth spinal nerve. 



31 rriinitive ulnar veiio-lymphatic. 



