218 



F. H. EDGEWORTH. 

 Text-fig. 46. 



JsUJC* 



^Vtwonui 



Text-fig. 47. 



VUvlxCh.!! 



Text-fies. 46-48.— Ceratodiis, embryo stage 48. Text-fig. 46 is 

 the most anterior. 



