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| snout, eye-brows, cheeks and ears. — Tail long, annulated, with long hairs; ears large, pointed; feet sub-plantigrade. | | | | | | | the fore limbs (together with an uniting band over the shoulders and back) and the hind limbs (except the thighs) blackbrown. — Tail nearly invisible; ears small, round; feet (according to the authors) subplantigrade. | | | | | | | spot under the throat; U. maritimus yellowish white all over the body. — Tail almost invisible; ears small, rounded; feet plantigrade (with hairy soles in U. maritimus.) |
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| Fig. 1. Basis cranii of A. Procyon lotor, B. Ælurus fulgens. b = bulla, c. a. = alisphenoid canal, c. c. = carotid canal, c. e. = Eustachian canal, f. c. = condylar foramen, f. g. = glenoid foramen, f. l. a., f. l. p. = anterior and posterior foramen lacerum, f. o. = oval foramen, f. s. m. = stylomastoid foramen, m. a. e. = meatus acusticus externus, p. m. = mastoid process, p. p. = paroccipital process, p. pg = postglenoid process. (The specimens are from the Copenhagen museum. Natural size.) |
| Skull short, rounded. | | | | | Skull short, rounded. | | | | | Skull rather elongated in some species (e. g. U. arctos, U. maritimus), short in others (e. g. U. ornatus, U. malayanus.) |
| Orbits with distinct postorbital processes from the frontals only. | | | | | Orbits with no postorbital processes. | | | | | Orbits often with distinct postorbital processes from the frontals (not in Melursus) and the zygomata. |
| Zygomatic arches very wide. Crista sagittalis rather high. | | | | Zygomatic arches extremely wide. Crista sagittalis very high. | | | | Zygomatic arches moderately wide. Crista sagittalis not high. |
| Anterior border of nostrils somewhat backward sloping. | | | | Anterior border of nostrils nearly vertical. | | | | Anterior border of nostrils very sloping only in the species with long skull. |
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