Previous Step (12b)
13a Lateral foveolae of vertex obsolete, or if present, forming a right or acute angle with the plane of the fastigium, the lateral foveolae are thus invisible from above. go to 14
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13b Lateral foveolae of vertex distinct and forming an obtuse angle with the plane of the fastigium, the lateral foveolae are thus visible from above. go to 24
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