SEALS. 



239 



case, however, that it may yet visit these islands, we give 

 a figure of its skull as a vignette to the present article. 

 This species may be readily recognized by its very dark 

 colour, its great size, and the form of its fore-feet, of 

 which the third toe is the longest ; the frontal portion of 

 the skull is much arched, as shown in the figure, and the 

 nasal bones are depressed in front, instead of being 

 nearly horizontal as in the other species. 



We have retained Ph. grcenlandica in our list, though 

 with much doubt, and have added two other species 

 which have been recorded since the date of our first 

 edition, namely, Ph. hispida and Cystophora cristata. 



