i fele) ANIMAL COMMUNITIES OF STREAMS 
REPRESENTATIVES OF THE POOL COMMUNITY 
Fic. 56.—A long-legged spider taken from a stone out of water in a stream 
(Tetragnatha grallator); twice natural size (original). Fic. 57.—Outside of shell of a 
small mussel from Hickory Creek (Alasmidonta calceola); natural size (original). 
Fic. 58.—Inside of the same. Fic. 59.—Inside of shell of mussel from Hickory Creek 
(Anodontoides ferussacianus, subspecies subcylindraceus Lea); natural size (original). 
Fic. 60.—Outside of the same. Fic. 61.—A snail from the still water of Thorn Creek 
(Campeloma subsolidum); natural size (original). Fic. 62.—A snail from the still 
water of Hickory Creek (Planorbis bicarinatus), seen from the left; natural size 
(original). Fic. 63.—The same seen from the right. 
