PLATE 8 



EXPLANATIOX OF FIGURE 



Fig. 10 Ventral view of the arteries, veins and lymphatics found in the head 

 and pharynx of a twenty-two-day rainbow trout embryo; not injected. P. E. 

 C. 648. 



REFERENCES 



1, Subocular lymph sac 



2, Medial pharyngeal communication; 

 the point at which the medial pharyn- 

 geal lymphatic communicates with 

 the precardinal vein 



3, The lateral pharyngeal lymphatic, 

 a continuous vessel through which 

 the subocular Ij^mph sac drains into 

 the veins in the trout 



4, Medial pharyngeal lymphatic 



5, Precardinal or jugular lymphatic 

 5', Independent anlage of the pre- 

 cardinal lymphatic which lies con- 

 tiguous to the precardinal vein and 

 just caudal to the medial pharyn- 

 geal communication 



6, Precardinal or jugular vein 



7, Point at which the precardinal lym- 

 phatic communicates with the lateral 

 pharyngeal lymphatic 



9, Cardino-Cuvierian communication; 

 the point at which the lateral pharyn- 



geal Ijanphatic communicates with 

 the precardinal vein in the cardino- 

 Cuvierian district 



10, Lymphatic of the lateral line of 

 the trunk 



11, Postcardinal vein 



12, Duct of Cuvier 



13, Otic communication; the point 

 at which the lateral pharyngeal lym- 

 phatic communicates with the precar- 

 dinal vein near the caudal end of the 

 otocyst 



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 



20, Caudal end of eye 

 22, Carotid artery 



24, Cardino-Cuvierian junction 

 27, Root of dorsal aorta 



90 



