456 THE AMERICAN NATURALIST [Vol. XLII 



only difference between a skeletal process and a tendon 

 is that one is invaginated from a relatively fixed part of 

 the body and the other from a moving part. While in- 

 sect tendons are, therefore, not homologous with the ten- 

 dons of vertebrates, it is probably wise to retain the 

 name just as in the case of femur and tibia for parts of 

 the leg, where likewise there is no homology with the 

 bones of vertebrates where the names primarily apply. 



