Memmler 1943 Perognathus Californicus June 9, M.V.Z. 4 drops of Equibb's codliver oil Containing Vitamins A+D. At 9 A.M. they weighed - Mike 6.3g + Pat 6.2 That is less in both cases than yesterday afternoon. Pat it was decided is a ♀ and Mike is a ♂. They have a sleek brown fur now, which lies close to the body. When we first got them they had just begun to get fur on the back. Here it was then a more grey color. The feet already had white fur when we found them, the tail had a definite bicolor white below and a dark grey above. They had very long whiskers. The main change the last few days has been in the length and color of the general body on the dorsal surface fur. Today I notice that more fur is appearing on the belly which has previously been naked. The white guard hairs have been visible for several days, particularly across the lower back when the animal sits humped. Before carrying the mice home last night I put some seeds in their carrying