322 MALL. [VoL. XIX. 
Fic. 330Bb. 
Fic. 330Ba. 
Fic. 330Ba.—The ovum. Natural size. 
Fic. 330Bb—The embryo. Nearly two diameters. 
Fic. 330Bc. 
Fic. 330Bc.—Sagittal section of the embryo. X 6 times. 
