92 Bulletin American Museum of Natural History. [Vol. XXVII, 



the orders into "series" having the rank of superorders; (3) the recognition 

 of the subonhnal rank of the Zeuglodontes and of the relationship of the 

 Cete with the Ferte; (4) the grouping of the Insectivora and Chiroptera, 

 which were regarded as divergent derivatives "from the same primitive stem 

 as the Ferae"; (5) the Ungulata are regarded as "probably the derivatives 

 from the same common stock as the Ferae"; (6) the Sirenia, Hyracoidea and 

 Proboscidea are evidently held to be related orders; (7) the Edentata are 

 regarded as the lowest order of the Monodelphia, "the structure of the skele- 

 ton and especially of the skull, the organs of generation, etc., appearing to 

 indicate with sufficient distinctness, that thus degraded are their rank." 



In his fuller classification of 1872 ('Arrangement of the Families of 

 Mammals,' Gill adopted Bonaparte's partition of the Placentalia into two 

 subdivisions "Educabilia" (including the Primates, Ferae, "Ungulata," 

 Toxodontia, Hyracoidea, Proboscidea, Sirenia, Cete) and "Ineducabilia" 

 (including the Chiroptera, Insectivora, Glires, Bruta). In the table of 

 contents of the same work the word "Eutheria" is placed in brackets in 

 front of both the terms "Placentalia s. Monodelphia" and "Didelphia," 

 while "Prototheria" is placed in brackets in front of "Ornithodelphia." 

 This implies that Gill recognized that structurally there was a closer rela- 

 tionship between the Monodelphia and the Didelphia than that between the 

 Didelphia and the Ornithodelphia, and his usage of the term Eutheria 

 undoubtedly antedates Huxley's usage of the same word in a different sense 

 (c/. p. 230).' 



GilVs Classification of 1870. 



Subclass Monodelphia. 

 I. Primate Series. 

 Order Primates. 

 Suborder Anthropoidea. Suborder Lemuroidea. 



II. Feral Series. 

 Order Ferse. 

 Suborder Fissipedia. ^^3 ([^^ Suborder Pinnipedia. 



Order Cete. 

 Suborder Zeuglodontes. Suborder Odontocete. Suborder Mysticete. 



III. Insectivorous Series. 

 Order Insectivora. ^_^J 11^^ Order Chiroptera. 



IV. Ungulate Series. 

 Order Ungulata. 

 Suborder Artiodactyla. Suborder Perissodactyla. 

 Order Hyracoidea. ^ ^J Order Proboscidea. d^^ Order Sirenia. 



V. Rodent Series. 

 Order Glires. 

 Suborder Simplicidentata. Suborder Duplicidentata. 



