LIST or PLATES Al^D MAPS. 



Froutisjiicce. Head of a typical rookery bull. 

 Drawii from nature by Bristow Adams. 

 I. — Progressive stages in the dentition of tbc young and female fur seal. 

 Drawn by Dr. J. C. McConnell. 

 II. — Progressive stages in the dentition of the male fur seal. 



Drawn by Dr. J. C. McConnell. 

 III. — Liver of young fur seal. 



Drawn by CMoe Leslie Starks. 

 IV. — Uterus of fur seal. 



Drawn by E. E. Snodgrass. 

 V. — Brain of fur seal. 



From i)hotograplis by Pierre A. Fish. 

 \l. — Brain of hair seal, Phoca vituVma. 



From photographs and drawings by Pierre A. Fish. 

 VII. — Brains of seals and bears. 



From photographs by Pierre Af Fish. 

 VIII. — Cranial capacity of the fur seal, young, female and adult male. 

 From photographs of casts of the cranial cavities. 

 IX. — A typical harem on Gorbatch Rookery, known as harem 25. 



From a photograph by H. D. Chichester. This photograph was taken to show that 

 the painting of numbers on the rocks had no influence on the seals. 

 X. — Massed harems on eastern end of Tolstoi Eookery. 

 From a photograph by H. D. Chichester. 

 XI. — Uterus and ovaries of fur seal. 

 XII. — The northern squid, Gonatus amoemts. 

 Drawn by Anna L. Brown. 

 XIII. — The Alaskan pollock, TTieragra chalcogramma. 



Drawn by A. H. Baldwin. 

 XIV. — The silver salmon, Oncorlujnchus Msutch, 

 Drawn by E.L.Todd. 

 XV. — Northern lamprey, Entosphenua tridentatus. 

 Drawn by A. H. Baldwin. 

 XVI. — Dead pups on Tolstoi in 1892. Showing the former ravages of Uncinaria. 

 From a photograph taken by the British commissioners. 

 XVII.— Dead pups on Tolstoi in 1896. 



From a photograph by C. H. Townsend. 

 XVIII. — Starved pup, and pup dead from Uucinaria. 

 From a photograph by C. H. Townsend. 

 XIX.— A windrow of pups on Tolstoi. 



These pups were washed from the lower portion of Tolstoi by the gale of August 17, 



1896, and had been long dead. 

 From a i^hotograph by J. M. Macoun. 

 XX. — Part of skeleton of young male fur seal killed on Zoltoi, prol)ably injured by bite of a 



killer, Orca orca. 

 XXI. — The killer, Orca orca. 



From a figure by Liitken. 



IX 



