TALIGEADA. 601 



determination. Apai't from the astragalus, the characters are those of the 

 CondijlartJira rather than of the Perissodactyla, and it is therefore to be sup- 

 posed that the carpus has also the characters of that order. This would 

 place the genus in the Pantodonta, which has the carpus nearly that of the 

 Taxeopoda, and the tarsus of the Biplartlira. The points of resemblance to 

 the Condylarthra are the following: The ilium is narrow. The humerus 

 has an epitrochlear canal. The superior molar teeth have but one internal 

 lobe. The resemblances to the Pantodonta are these: The cervical verte- 

 brae are plane and short. The femur has a third trochanter. The premax- 

 illary bone is dentigerous. The astragalar trochlea is as in the Periptychidce, 

 and the Prohoscidia ; that is, without groove, and slightly convex antero- 

 posteriorly, thus differing from that of the Pantodonta. The dentition is 

 especially like that of the Amhlypoda in general, and that of the superior 

 sei'ies is unlike anything known in the Diplartlira. 



I propose to place this genus in the AmUypoda for the present, next to 

 the Pantodonta, but it cannot enter that sub-order on account of the form of 

 its astragalus. These sub-orders of AmUypoda will be compared as follows: 



Astragalus with a head distinct from trochlea, with distal articular facets . . Taligrada. 

 Astragalus without head ; distal facets subiuferior Pantodonta. 



In the sub-order Taligrada, the single family Pantolamhdida: presents 

 the followino: characters: 



Superior and inferior molars with the cusps developed into Vs. Post- 

 glenoid process present; postympanic and paroccipital not distinct All 

 the vertebras with plain articulations. Humeral condyles without inter- 

 trochlear ridge. Femur with third trochanter. Digits of posterior foot 

 probably five. Metapodial keels small and posterior. 



PANTOLAMBDA Cope. 



American Naturalist, 1882, p. 41f-. Proceedings American Philosophical Society, 1883, p. 553. 



A considerable part of the skeleton of a species of this genus ha\ing 

 been sent me by Mr. D. Baldwin, I am able to throw much light on the 

 affinities of this curious genus. 



Canine teeth distinct; dental series continuous. Superior molars all 

 triangular; that is, with a single internal cusp. External cusps of premolars 



