"Lateral view of Amphioxus. The notochord runs from tip to tip. t., Tentacular cirri; G., reproductive…
"Diagram of the anatomy of Amphioxus, drawn as a semi-transparent object. a, anus; a.p., atrial pore;…
"Amphioxus lanceolatus. A, ventral; B, side view of the entire animal. an, anus; atrp, atriopore; cd.…