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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

Dorsal Valve

"Rhynchonella psittacea. Interior of doral valve. s, sockets; b, dental plates; V, mouth; de, labial…

The arteries of the face and scalp. The muscle tissue of the lips must be supposed to have been cut away, in order to show the course of the coronary arteries.

Facial Arteries

The arteries of the face and scalp. The muscle tissue of the lips must be supposed to have been cut…