PLATE 2 



EXPLANATION OF FIGURES 



Figs. 3-4 Lateral view of the arteries, veins and lymphatics found on the 

 left and right sides, respectively, of the head and pharynx in a fifteen-day steel- 

 head trout embryo; injected embryo. P. E. C. 726. 



REFERENCES 



1, Subocular lymph sac 



3", Otic lymph sac; anlage of the 

 lateral pharyngeal lymphatic which 

 lies near the caudal end of the otocyst 

 and which may establish a communi- 

 cation with the precardinal vein at 

 the otic communication 



3'", Cardino-Cuvierian lymph sac; 

 anlage of the lateral pharyngeal lym- 

 phatic which lies between the car- 

 dino-Cuvierian junction and the otic 

 lymph sac 



6, Precardinal or jugular vein 



9, Cardino-Cuvierian communication; 

 the point at which the lateral pharyn- 

 geal lymphatic communicates with 

 the precardinal vein in the cardino- 

 Cuvierian district 

 12, Duct of Cuvier 



14, Dorsal aorta 



15, Hyoidean artery 



16, First efferent aortic arch 



17, Second efferent aortic arch 



18, Third efferent aortic arch 



19, Fourth efferent aortic arch 

 22, Carotid artery 



78 



