. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. lOcm B. Figure 3. Mustela eversmanni beringiae ssp. nov. A. (F:AM 49336 Type) occlusal view of partial skull. B. (F:AM 49337) occlusal and lateral views of man- dible. tion is long and straight. The skull is bro- ken just posterior to the constriction. The upper teetli are crowded; there is no diastema between the canine and P-, and P^ is set obliquely in the jaw with the talon slightly overlapping P^. The incisor row is curved, and the width from the outer edge of the alveolus of the right l^ to the outer edge of the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. lOcm B. Figure 3. Mustela eversmanni beringiae ssp. nov. A. (F:AM 49336 Type) occlusal view of partial skull. B. (F:AM 49337) occlusal and lateral views of man- dible. tion is long and straight. The skull is bro- ken just posterior to the constriction. The upper teetli are crowded; there is no diastema between the canine and P-, and P^ is set obliquely in the jaw with the talon slightly overlapping P^. The incisor row is curved, and the width from the outer edge of the alveolus of the right l^ to the outer edge of the alveolus of tlie left P measures mm; this compares with a mean of mm (N 7, — imn) for Recent Mustela eversmanni michnoi and mm (N 67, — mm) for Recent Mus- tela nigripes. The canine is relatively long and slender, and P^ is relatively short and broad. Measurements of P^ fall within the observed range of measurements taken on the steppe ferret, and do not show any pro- portional differences. Only the alveolus of the left M^ is preserved; it shows that the inner lobe of the tooth was narrow. The left mandible, F:AM 49337, is per- fectly preserved, only the incisors are miss- ing (Fig 3B). The teeth are moderately worn and are close together. Po is set obliquely in the jaw and P4 slightly overlaps Ml. As with the other species of ferrets, the lower premolars are relatively short and broad, Mi shows no trace of a metaconid, the talonid of Mi is ridged and relatively narrow, and Mo is small. F:AM 30827, a partial left ramus broken off behind Mi, has more heavily worn teeth than F:AM 49337. The jaw is relatively massive in both speci- mens, the length of the tooth row exceeds those of Mustela eversmanni michnoi in my sample, but measurements of the teeth fall within the obser\'ed range of the other fer- rets measured. (See Table 4.) Comparison of the Alaskan material with both Pleistocene and Recent Mustela {Pu- torius) nigripes Audubon and Ba
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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
