Fig. 35. Invertebrate animals of a 16 square inch unit on mud bottom, 

 Habitat No. xxxvi, Field No. 834, water 1I/2 lect deep. The amphipod 

 Hyalclla predominates, followed by Planorbis pcjr7'HS. Agraylea 

 miiltipuHctata and Ascllus. 



