PLATE 9 



EXPLANATION OF FIGURES 



(Cryptobranchus allegheniensis) 



All the figures are natural size. 



262 Living larvae reared in the laboratory, anaesthetized with chloretone 

 and photographed about five weeks after hatching. 



263. Larva reared in the laboratory, killed in bichroniate-acetic-formalin 

 about two months after hatching and preserved in formalin. The specimen is 

 slightly shortened through the action of the fixing fluid. 



264 and 265. Two views of a larva reared in the laboratory, anaesthetized with 

 cliloretone and photograjihed about ten weeks after hatching. 



266. Larva reared in the laboratory, anaesthetized with chloretone and pho- 

 tographed about six months after hatching. 



267. Year-old larva captured and fixed in formalin August 27, 1909; a few weeks 

 later it was transferred to alcohol, in which it remaiiUMl nearly a year before being 

 photographe<l. 



576 



