PLATE 24 



EXPLANATION OP FIGURE 



Fig. 32 Photomicrograph of a transverse section of a twenty-day rainbow 

 trout embryo, taken through independent anlagen (3') of the lateral pharyngeal 

 lymphatic, at about the level of the hyoidean arteries; compare 3' in figures 8 and 

 32. P. E. C. 668, slide 1, section 98; injected embryo. 



REFERENCES 



3', Independent anlagen of the lateral 8, Cranial end of otocyst 



pharyngeal lymphatic which lie an- 15, Hyoidean artery 



terior to the otic communication 27, Root of dorsal aorta 



6, Precardinal or jugular vein 



122 



