84 



U. S. BUREAU OF FISHERIES. 



Seal Killings on Pribilof Islands in lf)20 — Continued. 

 ST. GEORGE ISLAND. 



Hauling groimd. 



North 



East CUffs and Staraya 



Artil. 



North 



EastChfTs 



North, Staraya ArtU, and 



East Cliffs. 



EastClifYs 



North and Starava Artil. 



East ClilTs and North 



East Roof and North 



Zapadni 



Staraya ArtU 



North 



East Reef 



North 



Zapadni 



East Reef and North 



North and Staraya Artil. 

 East Reef 



HauUng ground. 



Zapadni 



North and Staiayu Artil. 



East Reef ". 



North and Staraya Artil. 



East Reef and North 



North and Staraya Artil. 



East Reef ". 



North and Staraya Artil. 



East Reef ". 



North and Staraya Artil. 



East Reef and North 



do 



East crnis and North 



do 



do 



North and Staraya ArtU. 

 EastCUfts 



Total. 



Skins 



se- 

 cured. 



36 

 206 

 354 

 224 

 430 

 277 

 103 

 269 

 163 

 26 

 80 

 104 

 199 

 53 

 53 

 69 

 12 



4.428 



AGE CLASSES OF SEALS. 



The present method of classifyinfj seals of unknown a<;e has been 

 developed from experimental Avork conducted since the siniimer of 

 1912, when a large number of male and female pups of that season 

 were branded with a permanent distinctive mark. A few of these 

 animals have been killed in each season since 1912 and the body 

 lengths — from tip of nose to root of tail — and other data have been 

 recorded. On the basis of the growth attained by these seals in each 

 of the several j^ears, limits of carcass length have been adopted for 

 each year of age, and seals are now classified in accordance with the 

 position their respective carcass lengths occupy in the scale taken 

 from the branded animals. The limits now in use are as follows: 



Age Standards of Body Lengths of Seals. 



