74 EGGS OF DOG-FISH. 



Nature seems to have used the same kind of hgature to 

 fasten up the branches of a plant and to anchor the 

 egg of a fish. The tendrils of the egg of the nurse 

 hound are, \Yhen only slight^ stretched, ten inches long. 



Mr. Henry Lee was the first to discover, at the 

 Brighton Aquarium, the mode in which these dog-fish 

 managed to fix their eggs. 



The Piked Dog-fish is the most common of all the 

 sharks, and found everywhere in the British and Irish 

 seas. It is at once distinguished from all others by a 

 single spine, placed in advance of each of the two dorsal 

 fins; whence its name " pick," being synonj'mous with 

 pike or spike. It measures from three to four feet, and 

 is of a blue slate on the upper parts, the under being 

 yellowish white. The wounds it inflict are severe and 

 bad to heal. 



PIKED DOG-FISH {Squalus acaittJiiai^), common dog-fish 

 {Acanthias viiJ(jaris). 



These fishes often make their appearance in vast 

 numbers, and among the Western Isles and Orkneys 

 they are salted and dried for food. The livers yield a 

 quantity of oil, and the offal makes manure. The 

 Scotch call this fish hoe ; while on the southern coast 

 it goes b}' the name of bone-dog. It is ovo-viviparous, 

 and produces many young at a time. 



The Common Tope (SguaJus (/aleus, Canis f/aleus^ 

 GaleuH vidgaris), known by the names of Penny Dog, or 

 Miller's Dog, is not unfrequent along the southern coast 

 of England and Ireland, but is less plentiful in the 



