1891.] A Reply to Professor Marsh. 783 
| auspices of our National Survey, might spread abroad a score of 
Ka synonyms which, finding their way into literature, it would require 
years to eliminate. I am happy to see, however, that all recent 
writers, guided by their own critical faculty, and in some measure 
perhaps by my “ Review,” have taken from the two papers on 
“ Discovery of Cretaceous Mammals” only what they actually 
contain,—namely, valuable and interesting additional characters of 
two or three multituberculate genera, already partly known, besides 
the discovery of two small trituberculates, and have not recog- 
nized the four orders, eight families, sixteen new genera, and 
twenty-seven new species constituted by the author. 
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