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 globigerinae, a red clay many radiolarians or 



Fig. 180. — Sli.ark's tooth (Oxyrliina). 2.350 fathoms. 

 (Chall.)! 



Fig. 18.5. — Sealpellum Darwinii, 

 attached to manganese nodule. 

 (Chall.) \. 



Fig. 187. — Ear-bone (Zyphius). 2.. 37-5 fathoms. 

 (Chail.) 



globigerinse, 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. 



