THE FISHES, MOLLUSCA, AND OTHER OBJECTS. 43 



another only shells or grains of sand. The shells 

 are often fastened together even when their inmates 

 are yet alive, and the latter have to put up with this 

 forcible captivity till such time as the larva shall be 

 transferred to its next or winged stage of existence, 

 and the cementing material binding the elements of 

 its former case together, shall be dissolved away. 

 Another common form of caddis-worm case is 



Fig. 33. 



Case of Limncpkilus lunatus. 

 Fig. 34. 



Case of Anabolia ncnosa. 



made by an allied species, L lunatus, which, like the 

 species of an allied genus, Anabolia nervosa, makes its 

 tube of fine sand, or the equally fine fragments of 

 fresh-water shells. In both these species, the case 

 has attached to it small twigs or other pieces of 

 wood, as balancers. These twigs often extend far 

 beyond one end of the tube. In hunting for these 

 " small deer," it is more than probable you may 

 come across another species of caddis-worm called 



