IOO 



ANIMAL COMMUNITIES OF STREAMS 



Representatives of the Pool Community 



Fig. 56. — A long-legged spider taken from a stone out of water in a stream 

 (Tetragnatha grallator); twice natural size (original). Fig. 57. — Outside of shell of a 

 small mussel from Hickory Creek (Alasmidonta calceola); natural size (original). 

 Fig. 58. — Inside of the same. Fig! 59. — Inside of shell of mussel from Hickory Creek 

 (Anodontoides ferussacianus, subspecies subcylindraceus Lea); natural size (original). 

 Fig. 60. — Outside of the same. Fig. 61. — A snail from the still water of Thorn Creek 

 (Campeloma subsolidum); natural size (original). Fig. 62.: — A snail from the still 

 water of Hickory Creek (Planorbis bicarinatus) , seen from the left; natural size 

 (original). Fig. 63. — The same seen from the right. 



