SEA-ElSHERLES LABORATORY. 



199 



The electric apparatus of a skate; other fishes with 

 electric apparatus. 



Breediii g. — Skates, rays, dogfishes ^tnd sharks 

 breed quite differently from all other fishes. In the case of 

 most round fishes, flukes and soles, the eggs and milt are 

 shed into the sea and fertilization takes place there so that 

 there is no actual connection between the male and female. 

 But in the case of the skates, rays, dogfishes and sharks 

 the male makes connection with the female at the breeding 



Flounder 



Plaice 



Halibut. 



Eggs of various Fishes. — All natural size. 



season and the milt is passed into the body of the female 

 and fertilizes the eggs before they are shed. 



The eggs of these fishes are quite different from those 

 of the other fishes. They are very much larger and they 

 are enclosed in a hard horny case called the purse. 



Then most other fishes lay a great number of eggs at 

 one time (30,000 to 9,000,000), while a skate or dogtish 



