Pyramid cell – Consists of small even cells having the form of an inverted pyramid with a quadrangular base; separated by cell walls of uniform width and height.

Quadrangular cell – Also an inverted pyramid but with the point truncated.

Tri-helical cell – Consists of diagonal grooved lines.

Sphere cell – Consists of small evenly spaced cells having the form of an inverted half-sphere; cell count normally represents the numbers of cells within a square inch.

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