Biometrika, Vol. XIII, Part IV 
I'carson & Davin, Si'sa'iioids 
Plate XXXVII 
Fii,'. 9;j. Section of Filiular Crest of 
Yonny Platypus. • c. (jO. 
Fig. 96. Section of Filnilar Crest of 
Embryo Platypus. < c. (jO. 
