. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. i86 Bulletin So. Calif. Academy Sciences / Vol. 6^, No. 3, ip66 Equus (Plesippus) sp. Figure 1 Material: UCMP 64730, left upper molar (M^ or M') and UCMP 63731, right third metatarsal. Locality: Ritchie Creek, V-6317, probably from the Sonoma vol- canics. Age: Blancan, late Pliocene or early Pleistocene. The enamel of the parastyle, mesostyle and metastyle is missing at the occlusal surface of the upper molar. Farther down, the meso- style is broad, the parastyle is narrow and rib-like (Fig. I
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. i86 Bulletin So. Calif. Academy Sciences / Vol. 6^, No. 3, ip66 Equus (Plesippus) sp. Figure 1 Material: UCMP 64730, left upper molar (M^ or M') and UCMP 63731, right third metatarsal. Locality: Ritchie Creek, V-6317, probably from the Sonoma vol- canics. Age: Blancan, late Pliocene or early Pleistocene. The enamel of the parastyle, mesostyle and metastyle is missing at the occlusal surface of the upper molar. Farther down, the meso- style is broad, the parastyle is narrow and rib-like (Fig. IB). The prefossette, postfossette and other features of the lingual portion of the occlusal surface are preserved. The tooth is relatively hypsodont, being mm. high at the protocone and mm. high just labial to the posterolabial edge of the prefossette. The length of the occlusal a b. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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