648 J. T. PATTERSON 
to the villi of the definitive placental discs. Viulli also appear 
on the Triger 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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