. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DIVISADERO LARGO MAMMALIAN FAUNA 267 Definition: (Redefinition by the present authors.) Small no-to- 3-1-4-3 ungulates of primitive aspect. Dental formula 3-1-4-3. Dentition closely similar to that of Brachystephanus but differing in detail. Canines poorly differentiated. P1 very small. P2 abruptly larger, triangular. P3"4 with well developed protocone-parastyle loph and forming deep, closed fossette in early wear stages. M1"3 with strong, approximated parastyle and paracone ridges on buccal faces; metacone
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. DIVISADERO LARGO MAMMALIAN FAUNA 267 Definition: (Redefinition by the present authors.) Small no-to- 3-1-4-3 ungulates of primitive aspect. Dental formula 3-1-4-3. Dentition closely similar to that of Brachystephanus but differing in detail. Canines poorly differentiated. P1 very small. P2 abruptly larger, triangular. P3"4 with well developed protocone-parastyle loph and forming deep, closed fossette in early wear stages. M1"3 with strong, approximated parastyle and paracone ridges on buccal faces; metacone ridge present but less distinct. Buccal face with basal cingulum between paracone and metacone, deeply exca- vated and forming small buccal fossette above flattened ectoloph face. Protocone and hypocone well separated above base. Base on lingual side broad, somewhat flattened and shelflike. Strong anterior cingulum with tendency to extend around protocone to lingual face. Approximately equal posterior cingulum, shorter,. Fig. 12. Allalmeia atalaensis. No. 507 , type. Copy of sketch by Patterson of crown view of right upper teeth. X about ending lingually posterior to hypocone. M3 relatively larger than in Brachystephanus or Xcnostcphanus; metacone and metaloph reduced, metaloph not completely fused with small hypocone at lingual end. Crista obliqua of lower premolars abutting against base of metalophid, not running to metaconid. Bullae relatively smaller than in Brachystephanus and Xeno- stephanus, leaving fairly wide medial basioccipital-basisphenoid exposure and not extending to posterior end of 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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