320 MALL. [ Vou, XTX. 
Fic. 330Ab. 
Fic. 330Aa. 
Fic. 330Aa—Photograph of ovum. Natural size. 
Fic. 330Ab.—The embryo. Nearly two diameters. 
Fic. 330Ac.—Section of the embryo. XX 6 times. 
