VIII.] 



HOMOLOGIES. 



173 



the dog before spoken of. For this relationship Mr. Ray 

 Lankester has proposed the term " homoplasy." 



TAR8AL BONES OF DIFFERENT LEMUROIDS. 



(Eight tarsus of Galago ; left tarsus of Cheirogaleus.) 



" Serial homology " is a relation of resemblance existing 

 between two or more parts placed in series one behind the 

 other in the same individual. Examples of such homologues 



A CENTIPEDE. 



are the ribs, or joints of the backbone of a horse, or the 

 limbs of a centipede. The latter animal is a striking ex- 



