336 THE ruEKco fau:ma, 



squamosal bone. These display, besides the larg^e postglenoid process, a 

 well-dev'eloped preglenoid ridge, as in Arctocyonoidce, Oxi/aiiida, and Meso- 

 nychklee. A huge distal caudal vertebra of elongate t'orni indicates a long 

 tail. An articular extremity of a flat bone is intermediate in form between 

 the proximal end of the marsupial bone of Dklelphys and that of Sarcophi- 

 lus. Its j)rincipal and transverse articular surface is transversely convex, 

 as in the latter {S. ursinus), but the lesser articular face is separated from it 

 by an even shorter concave interspace than in the opossum. It has almost 

 exactly the form <it" tliat of the latter animal. It is a short, flat cone, with 

 two faces presenting on the same side; the one, part of the concavity men- 

 tioned, the other, flat and presenting away from it. This piece has a slight 

 resemblance to the very peculiar head of the fibula in. the opossum, but is 

 not like that oi Sarcopliilus ursinus. I, however, think it much more prob- 

 ably the proximal extremity of a marsupial bone. 



A sujjposed cuneiform is subtransverse in position, and resembles in 

 general those of Oxycena and Esthonyx. It has the two large transverse 

 proximal facets, the anterior one-quarter wider than the posterior. The 

 distal facet (trapeziotrapezoidal) is simple. The navicular is much like tliat 

 of Oxycena forcipata, but is more robust. Its external tuberosity is flattened 

 aiiteroposteriorly, and is produced proximally. The three distal facets are 

 well marked, the median a little wider than the external, while the internal 

 is subround, convex, and sublateral in position. The entocuneifonn is a flat 

 bone, with cup-shaped facet for the navicular and narrow facet for the first 

 inetatiirsus. This facet is transverse transversely and concave anteroposte- 

 riorly. It shows (1) tliat tliere is a pollex; (2) that it is probably small; 

 and (."')) that it was not opposable to the other digits, as is the case in the 

 opossum ; (4) it does not show whether the pollex has an imguis or not. 



Measurements No. 2. 



u. 



Traiisverso width condyle of maiKlildc (^230 



.■\iitoroiiost<i-ior width i-oiidyh' of ni»iidihh> (.it middle) "103 



niilUHtrr, hr.idofo.mam./mJ"""""'""'^ """!" 



f antcropcxiterior (KKV* 



Diaimt.-n. cuneiform J '■'•'•"''"' '^^^ 



< anttTopoHterior 01 1* 



