144 MAMMALIAN DESCENT. [Lect. Y. 



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Brontotheridse," Aiwr. Jour, of Science and Art, vol. vii., 



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Amer. Jnvr. (f Science, vol. xx., September 1880, \)\\ 235-239, 



figs. 1-2. 



In this paper Professor jNlarsh remarks ([). 228) : — 



" Mesozoic mammals have been very generally referred to tlie 



Marmpialia. An examination of all the known remains of 



