648 J. T. PATTERSON 



to the villi of the definitive placental discs. Villi also appear 

 on the Trager epithelium but they remain more or less rudimen- 

 tary (figs. 34, 35, 62-65; pp. 619-625). 



Marine Biological Laboratory 



Woods Hole, Massachusetts 



August 10, 1913 



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