of the Term “ Homology.” 117 
mogenetic basis: and if there ¢s room for diversity, then the 
concordance is most remarkable; for the homologies are so 
conspicuous as, in many cases, to be hardly disputable; and 
the result is, that the question as to the mode in which such 
homologies arose, though always a very interesting inquiry, 
becomes, as has been said, of subordinate importance. 
s to the difference in the mode in which certain bones are de- 
guments 
against the laying of so great a stress upon the mode of ossifi- 
cation as has of late been 
In the same way it does not seem unreasonable to regard the 
auricles and ventricles of birds as homologous with the auri- 
cles and ventricles of mammals, in spite of the diversity in their 
modeoforigin. Although the homology will be a homoplastic 
one, yet it will be an homology—the parts having a very close 
resemblance, in their relations to surrounding structures, in 
both birds and mammals. On the other hand, between these 
cavities and the chambers of the heart of a Myriopod there is 
ut a certain relation of analogy. 
With regard to the question, What here is “ covered by the 
term homology over and above homogeny?" in this case 
(as also in the relationship of certain homologous muscles in 
