170 J. B. Hatcher — Recent and Fossil Tapirs. 



don layer. Mr. Gidley, who found the specimen, informs me 

 that it is from the Oreodon beds below the Metamynodon layer. 

 No measurements of the type are given, except to say that, 

 "so far as the measurements are concerned, it agrees very 

 closely in size with G dakotensis." In giving the measure- 

 ments of the latter species they place in another column, for 

 comparison, corresponding measurements of G. occidentalism 

 but they do not give the measurements of Leidy's type, but 

 those of a smaller individual, referred by Wortman and Earle* 

 to that species ; in this way they obtain as the comparative 

 length of the last lower molar of G. procuspidatus and G. occi- 

 dentalis '025 of a meter for the former and *019 for the latter, 

 while the natural size figure of that tooth in G. occidentalism 

 published by Leidy in his description of the species, measures 

 a little more than *022 of a meter, showing, that both the 

 smaller measurements and the larger are well within the limits 

 of specific variation. I have therefore considered it best to 

 regard procuspidatus as also a synonym of occidentalis. 



Disregarding G longipes, which may or may not belong to 

 the genus Golodon, and which, if it should prove to belong to 

 that genus will quite likely be found to pertain to one of the 

 previously known species, the following is submitted as a key 

 to the species of Colodon. 



1. The internal cusps of sup. pms. 2, 3, 4, showing signs of division. 



Postero-internal cone of inferior pms. smaller than pos- 

 tero-external G. dakotensis. 



2. Two distinct internal cusps on sup. pms. 2, 3, 4. Postero- 



internal cone of inf. pms. as large or nearly as large as 

 postero-external G. occidentalis. 



Golodon (Lophiodon) occidentalis Leidy. 

 Syn. G. luxatus, G procuspidatus, and G. longipes ? 



There are in our collections several jaws and groups of teeth 

 referable to this species, a crown view of the inf. dentition of 

 one of these (No. 10953) is shown in fig. 6, plate III. It is 

 peculiar in the structure of pm. 2, in which tooth there is but 

 one anterior cusp, a character not seen in any other specimen 

 of Golodon. The postero-internal cone on all the premolars in 

 the present specimen equals in size the postero-external. 

 These characters might be regarded as of specific importance, 

 but I prefer to consider them as only individual variations, 

 after studying, with some care, the individual variations in the 

 structure of the teeth of modern Tapirs. In all of the jaws in 

 our collection referred to C. occidentalis, the teeth are propor- 



* Bull. Am. Mus. Nat. Hist., vol. v, p. 178. 



