BY R. BROOM. 729 



Plate XXIV. 



Fig. 9. — Mammary fcetus, 19 mm., g.l. 



Fig. 10. „ „ 23 8 mm., g.l. 



Fig.ll. ,, ,, 27 mm., g.l., (with nipple). 



Fig.l2. „ „ 15 mm., head length, (with nipple). 



Plate XXV. 



Fig. 18. — Mammary foetus, 23*5 mm., head length. 

 Fig.l4. ,, ,, 34 mm. „ 



Figs. 1-13 variously magnified ; fig. 14 natural size. 



||||_^Figs. 1, 2, 3, 4, 6, 9, 10, 11, 12, 13 and 14 are drawn from nature ; figs. 

 5, 7 and 8, from photographs by Dr. Beard. 



48 



