in deeper water. One pair each of C. propinquus and C. diogenes were 
placed in a wire cage in six feet of water at the mouth of Cherry creek 
July 21, 1908, and were fed from time to time. They were alive and in 
good condition when taken out August 24, 1908. It was found, however, 
that they would not live in extreme depths. One pair each of C. propin- 
quus and C. diogenes were placed in a wire cage in forty-five feet of water 
and were in good condition two days later. But when placed in sixty-five 
feet of water they perished in less than twenty-four hours. 
