Dorsal Valve

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“Rhynchonella psittacea. Interior of doral valve. s, sockets; b, dental plates; V, mouth; de, labial appendage in itsnatural position; d, appendage extended or unrolled.” — Encyclopedia Britanica, 1893


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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2400×2042, 1.2 MiB

Large GIF

1024×871, 141.2 KiB

Medium GIF

640×544, 73.1 KiB

Small GIF

320×272, 26.5 KiB