Vol. 6] Merriam: Virgin Valley and Thousand Creek. 247 



23a 



Figs. 21a and 21b. Probassariscus antiquus matthewi, n. gen. and n. var. 

 Mandible with dentition. Type specimen, no. 12539, natural size. Virgin 

 Valley Beds. Virgin Valley, Nevada. Fig. 21a, outer side; fig. 21b, 

 superior view. 



Figs. 22a and 226. Mustela furlongi, n. sp. Fragment of mandible with 

 M,. Type specimen, no. 12540, X 2. Thousand Creek Beds, Thousand 

 Creek, Nevada. Fig. 22a, outer side; fig. 22b, superior view. 



Figs. 23a and 23b. Mustelid, indet. Fragment of lower jaw. No. 

 12555, natural size. Thousand Creek Beds, Thousand Creek, Nevada. 

 Fig. 23a, outer side; fig. 23b, superior side. 



