268 THREE CRUISES OF THE “BLAKE.” 
deposit should be called a red clay, or a radiolarian ooze, or a 
globigerina ooze, or a blue mud. A pteropod ooze frequently 
contains many globigerine, a red clay many radiolarians or 
Fig. 186. — Shark's tooth (Oxyrhina), 2,350 fathoms. 
(Chall. ) 
Fig. 185. — Sealpellum Darwinii, 
attached to manganese nodule. 
(Chall.) 1. 
Fig. 187. — Ear-bone (Zyphius), 2,375 fathoms. 
(Chall.) 
globigerine, and a blue mud may have a large proportion of 
those organisms so characteristic of true deep-sea deposits. 
From the slow rate of accumulation of the red clay in the 
deep regions of the Pacific lying far from land, we may infer 
that the remains of tertiary sharks and whales are buried on 
the bottom. These are probably mingled with such bones of 
their recent representatives, teeth (Fig. 186), ear-bones (Fig. 
