EGGS OF SKATE, ETC. 



183 



stems of sea-weeds, stones, &c., the parent fish de- 

 voting much time and pains to properly fastening 

 them. The sea water gains admittance to the embryo 



Fig. 119. 



Pixy Purses. 



down these hollow tubes. The larger spotted dog-fish 

 or " nurse hound " (Scyllium stellare) are other good 

 objects for a large marine aquarium. Like the small 



