1910.] Taxonomic History of the Umjidata. 347 



In his 'Osteographie' de Blainville intimates that future paLieontoIogicai 

 discoveries will more completely bridge over the gaps between these sul)- 

 divisions of "les Ongulogrades." 



1840-45. Owen ('Odontography'). 



Ungulata 



1. Isodactyle, as Ox, Hog, Peccary, and Hippopotamus. 



2. Anisodactyle, as Horse, Tapir, Rliinoceros. 



3. Proboscidians. 



De Blainville's terms "a doigts pairs" and "a doigts impairs" are here 

 rendered into "Isodactyle" and "Anisodactyle." De Blainville's arrange- 

 ment is improved by the closer association of the Horse with the Tapir and 

 Rhinoceros. 



1847. Owen.i 



Ungulata 



Artiodactyla. 



1. Ruminant ia. 



2. Non-rviminantia. 

 Perissodactyla. 

 Proboscidia. 



Here the groups formerly characterized as Isodactyle and Anisodactyle 

 are given the ordinal names "Artiodactyla," "Perissodactyla." 

 1855. Wagner." 



Ruminantia. 



I. Fam. Cervina Moschus, Cervus, Camelopardalis. 

 II. " Cavicornia. [Sheep, Goats, Antelopes, Oxen.] 

 III. " Tylopoda. [Camels.] 

 Solidungula. Equus. 



Pachydermata. Hippopotamus, Sus, etc., Tapirus, Hyrax, Rhinoceros, 

 Elephas. 



This classification differed but little from that of Cuvier in 1800 and was 

 thus about half a century behind the times. Illiger's terms " Cavicornia," 

 "Tylopoda" are used. 



1858. Owen establishes the order Toxodontia. 



1866. Haeckel places the "ordo Ungulata" (Perissodactyla, Artio- 

 dactyla) together with the "ordo Cetacea" (including Sirenians and ceta- 

 ceans) as a second sublegion of the legion "Indeciduata," the first sublegion 

 comprising the Edentates. Hyrax, Toxodonts, Dinotherium, and the 



1 Quar. Jour. Geol. Soc, pt. IV for 1847. 



2 In Schreber's ' Saugethiere.' 



