186 
GAMMARIDiE. 
natural colour. Mr. Loughrin says, that his specimens 
were procured either from the throat of a cod-fish, or 
from the skin of the common dogfish ( Squalus acanthias ). 
The natatory legs of these specimens were thickly covered 
with a species of Vorticella , a circumstance which would 
suggest that they were animals of sluggish or quiet habits, 
rather than living on the surface of the fast-swimming dog- 
fish ; whilst their peculiar colour would induce the be- 
lief that they inhabited a sheltered and dark position, 
such as that of the throat of the codfish rather than the 
free ocean. 
The vignette represents a group of the Infusoria 
which infest this amphipod. 
