"Diagram showing the muscular system. M, ventral, N, dorsal valve; l, loop; V, mouth; Z, extremity of intestine; a, adductor; c, divaricators; c', accessory divaricators; b, ventral adjustors; c, peduncular muscles; b''', dorsal adjustors; P, peduncle." — Encyclopedia Britanica, 1893

Muscular System

"Diagram showing the muscular system. M, ventral, N, dorsal valve; l, loop; V, mouth; Z, extremity of…