[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.