THE SPERMIOGENESIS OF THE PRIBILOF FUR 

 SEAL ((^ALLORHINUS ALASCANUS J. AND (\)' 



JEAN REDMAX OLIVER 



The Histoloqicnl Lahornlnry of the Department of /'hi/siolnf/i/ ami l/istnlag!/, 

 Leland Stanford Junior University, Cdlifonila 



THIRTY-EIGHT FICURKS 



Notwithstanding the considerable' nunilier of inx-estigators, who 

 have studied the spermatogenesis of the niannnaha in recent 

 years, many questions remain undecided, and the number of 

 species examined is still but small. The domestic animals and 

 the more common wild forms have furnished practically all the 

 material thus far, and any addition to this number would seem 

 very desirable. The following account of the spermiogenesis in 

 the fur seal, Callorhinus alascanus Jordan and Clark, is offered 

 as such a contribution. 



The material, assigned to me by Prof. F. M. MacFarland for 

 this study, was preserved in the Pribilof Islands, Alaska, by Mr. 

 G. A. Clark, Special Assistant in Charge of Fur Seal Investi- 

 gations during the summer of 1909, to whom I desire to extend 

 my sincere thanks for his kind co-operation. Four different 

 fixatives had been used, namely, saturated corrosive subhmate, 

 Bouin's piero-formalin-acetic mixture, Lenhossek's sublimate- 

 alcohol-acetic, and strong Flemming's solution. Small pieces of 

 the fresh testes of two fur seals, one a young male of three years, 

 the other a fully grown adult of eight years of age, were fixed 

 in each of these reagents. All stages in the development of the 

 spermatozoa were found in material from each individual and no 

 important differences were noted, so that this paper is based 

 upon the study of preparations made froni both. The sublimate 

 material was dehydrated and iodinized in the usual way and, 



1 Published by permission of the H<.n. Ceorge X. I^owers. U. S. Commissioner 

 of Fisheries, Washington, D. C. 



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