1054 
PROFESSOR OWEN ON THE OVA OF THE ECHIDNA HVSTRTX. 
Description of the Plate. 
Fig. 1. Female organs of Echidna Hystrix ; both uteri laid open, and three ova 
exposed in situ in the left uterus. Natural size. 
Fig. 2. The largest of the three ova in the cell of the lining uterine substance, with 
filamentary portions of secreted matter passing across the ovum. Magnified. 
Fig. 3. Female organs of Echidna Hystrix; both uteri laid open, and one ovum 
shown in the right uterus. Natural size. 
Fig. 4. The ovum removed, with the hyalinion, h, partially torn to expose the yolk 
or germ-mass and the interspace between it and the outer tunic. Magnified. 
Fig. 5. The germ-mass of the same ovum, showing the fissure y ; the hyalinion, It, 
being reflected. Magnified. 
Fig. 6. A portion of the hyalinion. Highly magnified. 
