i860.] 



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 I. 



A 



MAMMALS, 

 NOT TRUE MARSUPIALS iNOR TRUE PLACENTAL8. 



"""N 







KANGAROO 

 FAM. 



DIDELPHY8 

 FAM. 



DIAGRAM II. 



TRUE MARSUPIALS, 

 LOWLY DEVELOPED. 



TRUE MARSUPIALS, 

 HIGHLY DEVELOPED. 



/ 



/' 



^r 



KANGAROO 

 FAM. 



PRES'ENT 

 MARSUPIALS 





DIDELPHY8 

 FAM. 



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 



