122 



THE DEPTHS OE THE SEA. 



[chap. III. 



arctictts, Sars, was met with sparingly in some of the 

 deej)er 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. 



Fig. 17. — Archaster bifrons, Wvvii.le Thomson. Dorsal aspect Three-fourths ol the natural 



size. (No. , r )7.) 



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 ; 



