EASTMAN : sharks' TEETH AND CETACEAN BONES. 



77 



The same author also makes the following statement regarding the 

 sharks' teeth observed daring the ''Challenger" Expedition :^ 



The distribution of the sharks' teeth in the deposits is similar to that of the 

 bones of Cetaceans, althougli they were dredged more frequently. They are 

 most abundant in the red clay areas far removed from land, and especially in 

 those of the central South Tacific ; they were less frequently taken in the organic 

 oozes of the deep sea, and only in one or two instances in the terrigenous deposits 

 surrounding continental or other land. It seems undoubted that many of the 

 teeth of sharks and the bones of the Ziphioid whales belong to Tertiary and ex- 

 tinct species. 



These results are expressed numerically in the subjoined table, in 

 which are recorded the position, depth, and bottom characters of all 

 " Challenger " stations in the Pacific where sharks' teeth and Cetacean 

 bones were obtained. At various other stations not included iu this 

 list, on the run from Hawaii to Peru, a few small teeth and otoliths of 

 indeterminable tishes were brought up. Otoliths, on account of their 

 dense structure and different chemical composition, are less readily 

 destructible than other bones of Teleost fishes. Only in three or four 

 instances were any piscine remains, other than otoliths and teeth, 

 observed in all the deposits examined by the " Challenger" naturalists. 



List of " Challenger " Stations Yielding Vertebrate Remains. 



1 Loc. rit., p 276. 



