44 W. Faxon — Dimor^phisni in the Genus Camha/rua. 



Such a change as this connected with the reproductive 

 periods is unparalleled, so far as I know, among the Inverte- 

 brata,' and even among the Vertebrata>f the cases of partial 

 atrophy of the generative organs or shedding of antlers (as in 

 the stag) after the rut is over are hardly comparable. 



At the time I had the specimens alive my attention had not 

 been drawn to the questions relating to the two forms of the 

 males, so that I failed to make anatomical examination, and 

 the specimens have now lain too long in alcohol to be service- 

 able for internal dissection. I hope, however, that naturalists 

 who are more favorably situated will be able to throw more 

 light on this subject. 



I will add that the males of extraordinary size which I have 

 seen, are all of the "first form." Do these very old individuals 

 cease to moult? Do they become permanently capable of re- 

 production ? 



Museum of Comparative Zoology, Cambridge, Mass., Nov. 12, 1883. 



