186 GAMMARIM. 



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. 



