but longer than | 1st and 3d long, | anterior and 2d; anterior and | 2d and 4th short; | posterior cingula posterior cingula | anterior and | small; occlusal large; occlusal | posterior cingula | pattern complex. pattern simple. | moderately large; | | occlusal pattern | | moderately complex. | | | | | M3--Three wide labial | Two moderately | Three narrow labial re-entrant folds | narrow labial | re-entrant folds of unequal length, | re-entrant folds | of unequal length, 1st short, 2d and | of equal length; | 1st long, 2d and 3d long; anterior | anterior and | 3d short; anterior and posterior | posterior cingula | and posterior cingula low, | moderately large; | cingula large; small; occlusal | occlusal pattern | occlusal pattern pattern simple. | moderately complex. | complex. | | | | m1--Anterior oblique | No anterior | No anterior re-entrant fold | re-entrant fold; 4 | re-entrant fold; separating equal | moderately narrow | narrow lingual sized protoconid | lingual re-entrant | re-entrant folds and metaconid | folds of equal | variable in cusps; 3 wide | length, 1st joining | number, often as lingual re-entrant | 1st labial | many as 4; folds of equal | re-entrant fold, | anteroconid well length; | 4th joining 2d | developed, encloses anteroconid absent;| labial re-entrant | 1 or 2 small lakes; occlusal pattern | fold; anteroconid | occlusal pattern simple; mesoconid | well developed, | complex; mesoconid present. | encloses | absent. | small lake; occlusal | | pattern moderately | | complex; | | mesoconid absent. | | | | | m2--Four wide lingual | Four moderately | Narrow lingual re-entrant folds | narrow lingual | re-entrant folds, of unequal length, | re-entrant folds, | variable in number, 1st short, other | 1st and 2d long, 3d | may be as many as 5; 3 equal and long; | and 4th short, 1st | anteroconid large, anteroconid | joins 1st labial | encloses moderately large; | re-entrant fold | complex folds from occlusal pattern | and 4th joins 2d | 1st labial re-entrant