"A, Cerianthus solitarius. B, Transverse section of the stomodaeum, showing the sulculus, sl, and the arrangement of the mesenteries. C, Oral aspect of Arachnactis brachiolata, the larva of Cerianthus, with seven tentacles. D, Transverse section of an older larva. The numerals indicate the order of development of the mesenteries." — The Encyclopedia Britannica, 1910

Cerianthus Solitarius

"A, Cerianthus solitarius. B, Transverse section of the stomodaeum, showing the sulculus, sl, and the…