124 



ORGANIC EVOLUTION 



have all been taken from the insects. Examples could be 

 found in other groups. Along our eastern coast is a small 



FlG. 31. A crab (Cryptolithndes sitchensis) which resembles a pebble. Its color is a bluish 

 gray, resembling a piece of slate. From a specimen collected in Puget Sound. 



spider found very frequently on the little roadside rush, 

 Juncus bufonius, which so closely resembles the buds of 



the rush in color and shape 

 that the most careful observer 

 could be excused for not detect- 

 ing the imposition (Plate 64, A\ 

 Many other spiders show special 

 protective resemblances (Plate 

 64). One of the crabs found in 

 Puget Sound is so exactly like 

 the pebbles of the bottom along 

 shore that no one would recog- 

 nize it as a crab until he saw it 

 in motion (Fig. 31). In the 

 tufts of floating seaweed, so 

 abundant in the Sargassum Sea, 

 there are small fishes of two 

 FIG. 32. -A "sea-horse -{Hippocampus species which in color are pe- 



mohnikei). a fish which is highly modified to i* i 1*1 ^i i *j_ i 



resemble the seaweed attached to which it CUliarly like the Seaweed itSClf 



lives. [After JORDAN, in the Proceedings /TI ^ /- \ T'l J 



of the United States National Museum.] (Plate 65). The Seaweed IS 



