304 



SHARP EYES 



strong odor, being in truth the perfected product of 

 these tube-cases beneath the water. 



A collection of caddis cases makes a very interesting 

 exhibit. I have shown a group of six foreign species, 

 but it is possible that any one of them may yet reward 

 our search in our native pools. I have found three 

 specimens that closely resemble some of them. 



