Dissection of Snail

"Dissection of snail. T., Short horn; TT., long horn with eye; N., cerebral ganglia; S.G., salivary glands on the crop; F., foot; M., columellar muscle; V.C., visceral coil; O.T., ovotestis; V., ventricle of heart; R. rectum; U., ureter; B.V., blood vessels returning to the auricle from the mantle; A., pulmonary aperture; MA., edge of the mantle."

Thomson, J. Arthur Outlines of Zoology (1916)