122 THE DEPTHS OF THE SEA. [CHAP. ITI. 
arcticus, SARS, was met with sparingly in some of 
the deeper dredgings. The known northern species 
of Archaster were abundant and of large size; A. 
parellii, D. and K., passing into comparatively shal- 
low water; and A. andromeda abundant at greater 
depths. 
Fic. 17.—Archaster bifrons, W¥VILLE THomson. Dorsal aspect. Three-fourths of the natural 
size. (No. 57.) 
At Stations 57 and 58, and at various others in 
the cold area, we took many specimens of a fine 
Archaster (Fig. 17) with a double row of large 
square marginal plates giving the edges a thickened 
square-cut appearance like those of Ctenodiscus ; 
