18 



THE ECOLOGY OF ANIMALS 



Habitat 

 Bare sand, same area 

 T^ine wood, same area 



Aspen parkland, mature poplar, 

 Southern Manitoba, Canada, 

 Lat. 50° 25' 



Prairie, same area .... 



Rotten fencing posts, near Ox- 

 ford 



Willows growing out of fence 

 posts, same place 



Permanent pasture soil, Cheshire 



Surface herbage on same 



Arable soil, Rothamsted, Hert- 

 fordshire 



Dried fruit, cocoa, spices, in Lon- 

 don warehouses 



River Wharf e, Yorkshire 



River Lark, East Anglia 



Plateau streams in Wales 

 Spring brooks, coast area, Wales; 

 Large rivers, coast area, Wales . 

 Intertidal (all zones), shore of 



Cardigan Bay, Wales 

 Mud, sea-bottom, Plymouth. 



England, Lat. 50° 20' 



Sand, same area 



Shell gravel, same area . 

 Sea-bottom, Dogger Bank 

 Mud, sea-bottom, Woods Hole, 



Massachusetts, Lat, 41° 50' 



Sand, same area 



Gravel, same area .... 

 Zostera beds, same area . 

 Rocks and rockweed, same area 

 Wharf pilings, same area 

 Coral reef fiat, Low Isles, Great 



Barrier Reef, Lat. 16° 23' S. 

 Mangrove swamp area, same 



islands 



Do 



44 



Morris (1920) 63 



Do. 106 



Morris (1922) 60 and 7S 



Morris (1927) 25-31 



It is not possible to point out the detailed allowances 

 that would have to be made to make these different 



