P. PEARSON 1950 31 Actna Spring, 800 ft., Nopa Co., Calif. march 25 1941 ♀ Cynomysinus rafinesquii Torpid in attic with 1942. Nipple medium · slight ant. fat. Banded 49-123019. Early pregnant. Rt. horn swollen but no measurable bump. Rt. horn 3.5 mm ant.· fat. Caught 3 p.m. Killed 11 p.m. Corpus luteum ·flesh, solid, in S2. Uterus quite secretary. Sperm in ut at lateral end, also at cervix. 22-cells in blastocyst. 1942 ♀ Cynomysinus rafinesquii carht as above. Nipple tiny. Banded 49-123062. No fat. Right horn larger than left - 1.8mm, ant., fat. Slightly swollen but not as much as, 1941. Corpus luteum is 3. Blastocyst floating in uterus 55° R 2+3. Uterus quite secretary. Fallow pit on cyst S2. 1 yr. old. 8/Cell blastocyst. 70 sperm cells. 1943 ♀ Cynomysinus rafinesquii Actna Mines. [Small] tunnel. carht 4 p.m. march 25. Killed 8 AM march 27. Epidid large in tail membrane. Testis purple, flabby, 3 x 5. epidid 2 x 4. Billions of very motile sperm. Accessories large, 8 mm. across. In section: sperm in epidid. Testis motion, northern deer. 1944 ♂ Parusina hummingbird march 27. 3.2 g. brought in by Dr. Stern, Pepe Creek, 3.- mi. SE Pepe Valley, Nopa Co., Calif. april 9 1945 ♀ Myoxia thysonoda 95 x 42 x 9 x 18 carht anguin with 3 other thysonoda ♂ and (♀ Cory) (under 7 on C R.) 1946 ♀ Cynomysinus rafinesquii argun. No other Cory, but 4 thysonoda. Cory torpid, nipple medium. U terus plump, no definite finding but enlarged. S1-much increased corpus, intact tissue limited. Good slides. S2-large in follicle. S3-more medial folds, uterus not glandular as at pre-implantation. S4-Surgeon early implantation (unknownated) no mark. 1947 ♀ Dipodonyx learmanni californicus 294 x 180 x 42 x 16 Lactating, mother. no scars 1948 ♂ Leop trowbridgii 120 x 49 x 15 x 8 shot by H. Childs. no endigya 1949 ♀ Entemice savanual sonoma, 197 x 96 x 33 x 21 shot by H. Childs. no endigya 1950 ♀ " " " 197 x 79 x 34 x 19