780 INDEX GENERUM MAMMALIUM. 
with those of De Blainville. As originally proposed by Doctor Gill,@ 
the Prototheria included the monotremes or Ornithodelphia, and the 
Eutheria the marsupials and placentals or both the Didelphia and 
Monodelphia. Gill thus used Prototheria and Eutheria as subclasses, 
and Ornithodelphia, Didelphia, and Monodelphia as superorders, an 
arrangement which has been recently followed by Hay. While these 
names do not appear in the following index, they are here given with 
full references because they are seldom indexed and it is difficult to 
find where they were first proposed. The references are as follows: 
Mammalia Linn xus, Systema Nature, I, pp. 12, 14, 1758. 
Ornithodelphia BLAINvILLE, ‘‘ Cours de la Faculté des Sciences, 1834 ^ ( * Ornith- 
odelphes')"; HuxzEvy, Med. Times & Gazette, London, new ser., I, p. 527, 
May 23, 1863. 
Didelphia Bra4rNviLLE, Bull. Soc. Philomatique, 1816, p. 117 (‘Didelphes’ ); € 
HoxrEevy, Med. Times & Gazette, l. c.. p. 527, 1863. 
Monodelphia BraiNviLLE, Bull. Soc. Philomatique, 1816, p. 117 (* Monodelphes’ ); 
Huxuey, Med. Times & Gazette, l. c., p. 527, 1863. 
Prototheria GiLL, Arrangement Fam. Mamm., p. vi, 1872. 
Metatheria HvxrEv, Proc. Zool. Soc. London, 1880, p. 64. 
Eutheria Git, Arrangement Fam. Mamm., p. v, 1872. 
Similarly, although no attempt has been made to index ordinal or 
subordinal names, which are also outside the scope of this work, ref- 
erences for such as are accorded recognition will be found under the 
names themselves. The ordinal names Allotheria, Cete, Fer, and 
Glires have been adopted on grounds of priority instead of the better 
known terms Multituberculata, Cetacea, Carnivora, and Rodentia. 
The name Bruta of Linnzeus also has strong claims for adoption in place 
of the much later Edentata, and it has been recently adopted by Hay.? 
Edentata is here used, not because it is better entitled to recognition, 
but chiefly because under the alphabetical arrangement the related 
families of Edentata and Effodientia are thus brought together instead 
of being widely separated, as would be the case if the former groups 
were entered under Bruta. 
In family names the designation in common use has been followed 
unless some good reason has appeared for selecting another name, as 
when the generic name on which the family name is based 1s antedated 
or preoccupied by some other name. When a choice has been possi- 
ble the earliest published family name has been used in preference to 
the name based on the first described genus, unless the latter happens 
to be in common use (for example, Erethizontid:e instead of Coendide), 
but in such cases attention is called to the fact. Under the arrange- 

“See Arrangement Fam. Mamm., pp. v, vi, 45, 46; Johnson's New Univ. Cyclo- 
pedia, III, p. 262, 1877 (art. Mammalia); Am. Naturalist, XXII, p. 259, 1888. As 
used by Huxley, Prototheria, Metatheria, and Eutheria are synonymous with De 
Blainyille’s earlier names. 
^ Fide WarEnHOvsE, Jardine's Nat. Library, Mamm., XI, Marsupialia, p. 56, 1841. 
« Didelpha Bonaparte, Syn. Vert. Syst., p. 8, 1838. 
4 Cat. Fossil Vertebrata N. Am., p. 571, 1902. 
