RODENTIA 187 



4. Re-study of Dcemonelix and a more exact and conclusive explana- 

 tion of the formation of these "burrows." 



5. Our acquaintance with the later Miocene and Pliocene Rodentia in 

 this country is very imperfect. More, and more complete material is 

 very greatly needed. 



6. A thorough study of the evolution of the cheek teeth in rodents, 

 which will enable us to distinguish between parallelism and affinity more 

 satisfactorily than has yet been done. 



MARSUPIALS, INSECTIVORES, AND PRIMATES 



BY WILLIAM K. GREGORY 



CONTENTS 



Page 



General publications 1^'^ 



Marsupialia 188 



Multituberculata 19^ 



Pantotheria 191 



Insectivora 192 



Primates 194 



Conclusion 196 



Gen^eral Publications 



In a review of the progress of the last ten years in the field of the 

 Marsupials, Insectivores, and Primates, it seems appropriate to record 

 the publication of several works of a general character, which have dealt 

 with these orders in relation to the mammals as a whole. First in im- 

 portance is Prof. Max Weber's books, "Die Saugetiere," published in 

 1904. This is by far the greatest modern work on the mammals, and it 

 makes available for the paleontologist the far-reaching but hitherto 

 widely scattered and uncoordinated results of comparative anatomical 

 research. 



In a recent work by the present writer^ the orders under consideration 

 have been discussed in some detail, and in their relations to other groups, 

 from the point of view of phylogeny and classification. 



A work by van Kampen^ on the tympanic region of the mammalian 

 skull, although dealing with a restricted problem, is of great value in 

 phylogenetic questions. 



1 The Orders of Mammals. Bull. Amer. Mus. of Nat. Hist., vol. xxvil. 1010. 



2 Die Tympanalgegend des Saugetierscbjidels. Morphol. .Tahrb., Bd. xxi, 1005. 



XIV — Bull. Gbol. Soc. Am., Vol. 23, 1911 



