"Acorn-shell (Balanus tintinnabulum). T., tergum; CR., thoracic legs; R., outer shell in section; D., aperture of oviduct; F., mantle cavity; X., depressor muscle of tergum; AN., antennae; OV., ovary; G., depressor of scutum; H., oviduct; AM., adductor muscle of scuta; S., scutum." -Thomson, 1916

Acorn Shell

"Acorn-shell (Balanus tintinnabulum). T., tergum; CR., thoracic legs; R., outer shell in section; D.,…

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

Scutum

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

Scutum

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

Scutum

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

Scutum

The scutum was a semi-cylindrical shield used by ancient Roman legionaries.

A Roman scutum shield.

Roman scutum

A Roman scutum shield.