Fig. 30. Invertebrate animals from 768 square inches on mud bottom, Habitat 

 No. clvii, Field No. 1037, water 15 feet deep. The great predominance oi" 

 mollusks (140 specimens) over associated animals (3) is to be noted. Amuicola 

 and Vahata are the principal genera present. The caddis-fly cases are all 

 empty. 



