Anatomy of Notorycten typhlops. 



107 



of the relationship of the particular animal to Monotreme or 

 Eutherian sub-groups, we must certainly regard Notoryctes, with 

 its large and important internal iliac arteries, as a highly 

 developed member of the Marsupial group, thus corroborating 

 what has already been found in dealing with Jacobson's Organ, 

 namely, that there is an affinity between Notoryctes and the 

 lower forms of Eutheria, distant though that relationship may 

 be.- 



DESCRIPTION OF PLATES VI.-IX. 



REFERENCE LETTERS. 



2 Since writing the above, a memoir by Dr. B. A. Bensley has appeared in the Transac- 

 tions of the Linnean Society of London (Dec, 1903), on "The Evolution of the Australian 

 Marsnpialia," which, while confirming the close relationship of Notorvctes with the 

 Phalanfferidae, does not show any very close connection with the Macropodidae. nor is it 

 easy from it to reconcile the resemblances to the American opposums in the blood vessels, 

 with the emphasis laid by Owen on the evidence of the internal iliac vessels. 



