THE LEGS OF TRILOBITES 



Fig. 201. — Drawing of Triarthrus hecki, a Trilobite from the 

 Silurian rocks (Ordovician) of New York, of which the 

 legs and antennae are well preserved, although no other 

 Trilobite has been found showing these parts. (Lent by 

 Macmillan & Co.) 



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