PORBEAGLE GROUP. 
5 2 5 
the young than in the adult. Feeding on molluscs and crustaceans, this species 
(which ranges over most warm seas) produces about a dozen young at a birth, 
these being attached by a placental structure to the walls of the uterus of the 
parent. Curiously enough such connection is, however, totally wanting in the 
young of the other British species (M. vulgaris). In habits the hounds are bottom- 
haunting species, as indeed might be inferred from the nature of their food. On 
SPINY DOG-FISH AND SMOOTH HOUND (1 Hat. size). 
the English coast the smooth hound generally makes its appearance during the 
summer in pursuit of the shoals of pilchard and herring. Several other genera of 
this family must be passed over without notice. 
The Porbeagle Group,— Family Lamnibje. 
Agreeing with the typical sharks in the position of the two spineless dorsal 
fins, the members of the present family may be distinguished by the absence of a 
