Animals Before JIa/i 



fully combining the results obtained from very 

 many sections it was possible to build up 

 these appendages and reconstruct their form. 

 And, after all this had been done, two good- 

 sized specimens came to light with all of the 

 legs in place ; and finally 

 a locality was found near 

 Rome, N. Y., where many 

 specimens of a small species 

 of trilobite occurred in such 

 an exceptional state of pres- 

 ervation that not only legs, 

 but delicate antennae were 

 clearly to be seen. The 

 long-sought-for appendages 

 A trilobite, Triarthrus served, according to their 



beeki, showing the ] ocat ; on as j aws ; ] e ^ s au( J 



antenna and limbs. 



About natural size, breathing organs, being fine 



examples of the modifica- 

 tion of similar parts for very different purposes. 

 Thus, trilobites are good illustrations of what is 

 termed generalized structure the absence of 

 special organs, each, or each series, of which is 

 specially devoted to the performance of some 



66 



