PLATE 7 



EXPLANATION OF FIGURE 



Fig. 9 Ventral view of the arteries, veins and lymphatics found in the head 

 and pharynx of a twenty-one-day rainbow trout embryo; injected embryo. P. E. 

 C. 646. 



REFERENCES 



1, Subocular lymph sac 



2, Medial pharyngeal communication ; 



the point at which the medial pha- 

 ryngeal lymphatic communicates 

 with the precardinal vein 



3', Independent anlagen of the lateral 

 pharyngeal lymphatic which lie an- 

 terior to the otic communication 



3", Otic lymph sac; anlage of the lat- 

 eral pharyngeal lymphatic which 

 lies near the caudal end of the 

 otocyst and which may establish 

 a communication with the pre- 

 cardinal vein at the otic communi- 

 nication 



3'", Cardino-Cuvierian lymph sac; 

 anlage of the lateral pharyngeal 

 lymphatic which lies opposite to 

 the cardino-Cuvierian junction and 

 between the latter and the otic 

 lymph sac 



4, Medial pharyngeal lymphatic 



5", Anlage of the precardinal lymph- 

 atic which lies contiguous to the 

 otic communication and which es- 

 tablishes a connection with the lat- 

 eral pharyngeal lymphatic 



5'", Anlage of the precardinal lym- 

 phatic which lies, approximately, 



opposite to the origin of the third 

 efferent aortic arch 



6, Precardinal or jugular vein 



7, Point at which the precardinal lym- 

 phatic communicates with the lat- 

 eral pharyngeal lymphatic 



9, Cardino-Cuvierian communica- 

 tion; the point at which the lat- 

 eral pharyngeal lymphatic com- 

 municates with the precardinal vein 

 in the cardino-Cuvierian district 



10, Lymphatic of the lateral line of 

 the trunk 



11, Postcardinal vein 



13, Otic communication; the point at 

 which the lateral pharyngeal lym- 

 phatic communicates with the pre- 

 cardinal vein near the caudal end 

 of the otocyst 



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 



27, Root of dorsal aorta 



31, Independent anlage of a lymphatic 



which arises along the course of the 



hyoidean artery 



