. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ^m 2d Fig. 1. Prosciurus? sp. V-5952, EM3, xlO. Figure 2. Tamias sp. 2a. V-6021, LMi°r2, xl5. 2b. V-6020, RP4, xl5. 2c. No. 3873, LMj, xl5. 2d. V-5951, RM3, x20. is now known from the basal Miocene of South Dakota (Mac- donald, pers. com.), and also from the early Miocene in Wyoming (Black, 1960). It is somewhat surprising, therefore, to find this genus in the later part of the early Miocene of Florida. The presence of Prosciurus in Florida at a later date than it is known to o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. ^m 2d Fig. 1. Prosciurus? sp. V-5952, EM3, xlO. Figure 2. Tamias sp. 2a. V-6021, LMi°r2, xl5. 2b. V-6020, RP4, xl5. 2c. No. 3873, LMj, xl5. 2d. V-5951, RM3, x20. is now known from the basal Miocene of South Dakota (Mac- donald, pers. com.), and also from the early Miocene in Wyoming (Black, 1960). It is somewhat surprising, therefore, to find this genus in the later part of the early Miocene of Florida. The presence of Prosciurus in Florida at a later date than it is known to occur in the Great Plains lends support to the suggestion made by Wood (1947) in regard to the mylagaulid tooth, that Florida may have been isolated from the main center of evolution of these families and acted as a refugium for the more primitive forms. Measurements a-p tr. RM3 Family SCIURIDAE Tamias sp. Figure 2 Material. No. 3873, partial mandible with LMX; V-5951, RM3 ; V-6021, LMlor-; V-6020, RP4. Description. The upper molar is unworn and shows a high, somewhat compressed protocone. The anterior cingulum is broad and joins the protocone at its base, well below the level of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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