270 • Albert A. Dahlberg 



Buccal 



Deflected 

 wrinkle 



Distal 

 trigonid 



ridge 



Ml enamel island ,,MI 



Mesial 



Terminal 



Distal 



Lingual 



Figure 1. Twelve occlusal views of lower right molar teeth; heavy black indicates 

 various patterns of "deflecting wrinkle" on buccal aspects of metaconids (mesiolingual 

 cusps). Deflecting wrinkle seen as a heavy crest (T-19 64) extending buccally from 

 occlusal tip toward protoconid and deflecting distally as it reaches central fossa. Deflect- 

 ing part generally continuous in deciduous second molar and permanent first molar, but 

 can be separated from a terminal island of enamel. Frequently, separation is incomplete 

 and occurs in vicinity of midpoint of distal trigonid ridge, as seen in sketches BH, 

 1-1464B, R.D.H., and M2of 7A. (Figure drawing courtesy of Marcia Bakry, Smithso- 

 nian Institution, Department of Anthropology, Washington, D.C.) 



Distal 



trigonid 



ridge 



Zagreb Paleopathology Symp. 1988 



