PLATE 27 



EXPLA.VATION OF FIGURES 



Fig. 35 Photomicrograph of a transverse section of a ourteen-day steelhead 

 trout embryo, taken through the more posterior of the two cardino-Cuvierian 

 lymph sacs (3'") found on the right side of this embryo; see reconstruction, figure 

 2. P. E. C. 696; slide 1, section 122; injected embryo. 



Fig. 36 Photomicrograph of a transverse section of a fifteen-day steelhead 

 trout embryo, taken through the right otic lymph sac (3") and an independent 

 anlage (5") of the precardinal (jugular) lymphatic; compare 3" and 5" in figures 

 4 and 36. P. E. C. 726, slide 1, section 116; injected embryo. 



REFERENCES 



3", Otic h'mph sac; anlage of the 

 lateral pharj'ngeal IjTnphatic which 

 lies near the caudal end of the oto- 

 cyst and which ma}- establish a com- 

 munication with the precardinal vein 

 at the otic communication 



3'", Cardino-Cuvierian lymph sac; 

 anlage of the lateral pharyngeal lym- 

 phatic which lies opposite to the car- 

 dino-Cuvierian junction 



5", Anlage of tlie precardinal lym- 

 phatic which lies contiguous to the 

 otic communication and which es- 

 tablishes a connection with the lat- 

 eral pharyngeal lymphatic 

 6, Precardinal or jugular vein 

 14, Dorsal aorta 

 17, Second efferent aortic arch 



128 



