The Extant Greek Works of Apollonius of Perga, Vol. I

III, 16:

Two rows of three geometric diagrams each, labeled with Greek letters.
Top row:
1. A rectangle with vertices labeled ζ (top-left), ε (top-right), and δ (bottom-right).
2. A triangle with vertices labeled α (top-left), ε (top-right), and η (bottom apex).
3. A square with vertices labeled ε (top-left), α (top-right), α (bottom-left), and ε (bottom-right).
Bottom row:
1. A square with vertices labeled β (top-left), γ (top-right), γ (bottom-left), and β (bottom-right).
2. A triangle with vertices labeled α (top-left), θ (top-right), and γ (bottom apex).
3. A square with vertices labeled α (top-left), γ (top-right), γ (bottom-left), and α (bottom-right).

Codex c presents this order; in V, two figures are combined. In the first rectangle, V omits δ; in the first triangle, c swaps ε and η; in the second, V omits γ; in the square αγ², V omits the lower letters, and c omits the lower α. These illustrate the words of Apollonius on p. 350, 5 sq.

III, 19 (read at the end of prop. 17):

Two rows of three geometric diagrams each, labeled with Greek letters.
Top row:
1. A square with vertices labeled α (top-left), ζ (top-right), ζ (bottom-left), and α (bottom-right).
2. A triangle with vertices labeled δ (top-left), τ (top-right), and ζ (bottom apex).
3. A square with vertices labeled δ (top-left), ζ (top-right), ζ (bottom-left), and δ (bottom-right).
Bottom row:
1. A rectangle with vertices labeled η (top-left), λ (top-right), and ι (bottom-right).
2. A quadrilateral (trapezoid) with vertices labeled ρ (top-left), ξ (top-right), κ (bottom-left), and λ (bottom-right).
3. A rectangle with vertices labeled μ (top-left), λ (top-right), and ξ (bottom-right).

Codex c omits this series; v has the first three figures, V omits them; in αζ², v omits the lower letters; in ηλ × λι, V omits η and λ, while v has μ and α in their place; in ρκλξ, V omits ξ, while v has ζ for it; in μλ × λξ, v has μ and λ, while V omits them. As Zeuthen saw, the passage on p. 358, 2 sq. is illustrated: