i86o.] 



PEDIGREE OF MAMMALIA. 



135 



A, in the following diagrams, represents an unknown form, 

 probably intermediate between Mammals, Reptiles, and Birds, 

 as intermediate as Lepidosiren now is between Fish and 



DIAGRAM II. 



Batrachians. This unknown form is probably more closely 

 related to Ornithorhynchus than to any other known form. 

 I do not think that the multiple origin of dogs goes against 



