Acorn Shell

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“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




J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


TIFF (full resolution)

2400×2030, 1.0 MiB

Large GIF

1024×866, 169.9 KiB

Medium GIF

640×541, 87.4 KiB

Small GIF

320×270, 29.8 KiB