calcification

Given our growing social calcification, the need to boost growth and social mobility is great.

As for the calcification of the two valves together, we have seen, under the last variety, how little important a character it is.

Any deviation in calcification (except the cusps of the first permanent molars) must occur after birth.

The illustration (Fig. 50) shows the progress of calcification and development of the temporary set of teeth.

The notochord is persistent and the calcification of the endoskeletal cartilage is only superficial.

Tectospondyli (Squatina, Raia, Trygon), in which there are several concentric rings of calcification.