[2.] [Scalpellum rutilum], (magnified two and a half times).

[2a´.] [Scalpellum rutilum], Internal view of scutum, enlarged.

(a.) Depression for the adductor muscle.

(b.) Cavity for the reception of the male.

[2b´.] [Scalpellum rutilum], External view of carina.

[2c´.] [Scalpellum rutilum], Section across middle of carina.

[3.] Complemental Male of [Scalpellum Peronii], greatly magnified.

[4.] Complemental Male of [Scalpellum villosum], greatly magnified.

(a´.) Natural size.

[4, a, b, c.] Ditto, valves separated.