Code 1957 Micrortus micinus July 1, Ynict- today on the slope by Redbill, I dug out a burrow system. It was in the shape of a cross with the long axis running down hill there: ↑ up the long axis tunnel was 2-4 inches below the surface; also the short cross tunnel. The next chamber- was ca. 10 inches deep and contained a rest of fine grasses-almost cleft with a few ptarmigan feathers. There was also the dried skin and parts of skeleton of a M. micinus, adult, in there. The long axis was ca. 2 1/2 feet with entrances at both ends. The short side branch was c. 10 inches and the tunnel to the next chamber was about a foot. The next cham- ber itself was roughly globular and about 6 inches in diameter. It was completely filled up by the nesting material. The tunnel was in what Teelwos calls the "Arctic Breeze rail."