3 



elevated, the internal more obtuse and directed inwards. The shaft is 

 thus sub-triangular in section. The distal extremity is nearly at right 

 angles to the axis of the proximal and is much expanded transversely. 

 A large part of this expansion is caused by the truncate internal tuberos- 

 ity, and by the less prominent external one. The latter is continued in 

 a thin ala which only sinks into the shaft at its middle. The condyles 

 are small, the external the most prominent. There is a shallow olecranar 

 fossa, and no coronoid, and hence no superconclylar foramen. There is 

 an arterial foramen above the internal tuberosity. 



The ulna is compressed, and contracts rapidly to the extremity. The 

 olecranon is broad and obtuse and the humeral cotylus oblique to the 

 long axis. The coronoid process is low. The shaft is remarkably 

 curved from right to left (inwards). The radius has a discoidal head 

 with central depression, and it was evidently capable of complete rota- 

 tion. It exhibits a tuberosity and slight flexure below the head. The 

 distal extremity has a horizontal triangular section with the apex inter- 

 nal and truncate ; the shaft near it is quite flat. 



The left ilium is obspatulate and flat, widest at the convex crest, and 

 slightly concave on the outer side. It is rather thin, and the impression 

 for the sacral diapophyses is elongate. The inferior border thickens 

 gradually to the acetabulum ; the superior is excised so as to form an 

 open concavity. 



The right femur is remarkable for its length. Its shaft is flattened 

 from before backwards, and without flexure. The great trochanter is 

 large, and embraces a deep in-looking fossa. There is a flat tuberosity 

 looking outwards just below, and the little trochanter is a little below 

 opposite to it. The condyles are sub-similar in size, the trochlear sur- 

 face wide, but not flat, and the inner border thickened and considerably 

 elevated. The femur is 1.75 times as long as the humerus; it was 

 scarcely longer, though a small piece is wanting from the shaft of our 

 specimen. 



Remarks. Having described the more important parts of the skeleton 

 preserved, 1 now proceed to consider its systematic position, and the 

 order to which it should be referred. 



The first impression derived from the appearance of the lower jaw and 

 dentition, and from the humerus, is that of an ally of the coati {Nasua). 

 The humerus indeed is almost a fac-simile of that of Nasua, the only 

 difference being a slight outward direction of the axis of the head. The 

 same bone resembles also that of many marsupials, but the flat ilium, 

 elevated position of dental foramen, and absence of much inflection of 

 the angle of the lower jaw, etc., render affinity with that group highly 

 improbable. The length of the femur indicates that the knee was 

 entirely free from the body as in the quadrumana, constituting a 

 marked distinction from anything known in the Carnivora, including 



