O, 41.—Cell resting on 41 (the 1st part of V, 4), a "basal" cell.
O, 42.—Cell resting on 42 (the 2nd part of V, 4).
O, 4b.—Cell resting on 4b (a lower branch of V, 4).
O, 51.—Cell resting on 51 (the 1st part of V, 5), a "basal" cell.
O, 52.—Cell resting on 52 (the 2nd part of V, 5), a "discal" cell.
O, 53.—Cell resting on 53 (the 3rd part of V, 5), a "marginal" cell.
O, 6.—The Anal Cell.
O, 7.—The Axillary Cell.
O, 8.—The Subaxillary Cell.
O, 9.—The Alula, or Axillary Lobe.