AN EMBRYO RAY AND ITS MEANS OF NOURISHMENT. 



Fig. 24. — Tip of a milk-secreting filament of a Bat-ray {Fteroplatara 

 micrura\ showing the arteriole, and the capillary network in the meshes 

 of which the milk-glands are embedded. Magnified forty-two time?. 



Fig. 25. — Early shark-like embryo of the Indian Bat-ray (/V/r^"- 

 platcea micrura)^ natural size. Only a few of the external gill-filaments 

 are represented. 



[ To face page 2 1 2 



