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"<em>R.A.</em>, right auricle; <em>L.A.</em>, left auricle; <em>R.V.</em>, right ventricle; <em>L.V.</em>, left ventricle; <em>P.A.</i., pulmonary artery; <em>A</em>, pulmonary artery and vein of right lung; <em>B</em>, pulmonary artery and vein of left lung; <em>C</em>, carotid artery to head, showing branch of left subclavian artery; <em>D</em>, portal vein; <em>F</em>, hepatic artery; <em>G</em>, superior vena cava, bringing blood from head and upper limbs to right auricle." &mdash; Blaisedell, 1904

Diagram of the circulation of the blood

"R.A., right auricle; L.A., left auricle; R.V., right ventricle; L.V.,…

"Waldheimia flavescens. Interior of dorsal valve. c, c', cardial process; b', hinge-plate; s, dental sockets; l, loop; q, crura; a, a', adductor impressions; c, accessory divaricator; b, peduncle muscles; ss, septum." &mdash; Encyclopedia Britanica, 1893

Dorsal Valve

"Waldheimia flavescens. Interior of dorsal valve. c, c', cardial process; b', hinge-plate; s, dental…