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, when only slightly stretched, ten inches long. 



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

 Brighton Aquarium, the mode in w^hich these dog-fisli 

 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 synonymous 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 accintJiias), common dog-fish 

 [Acanthias vulgaris). 



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 by the name of bone-dog. It is ovo-viviparous, 

 and x3roduces many young at a time. 



The Common Tope [Squalus cjaleus, Canis galeusy 

 Galeus vulgaris), 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 



