Nikolaus Reusner (1545–1602; also known as Nicolaus Reusnerus) was a Prussian jurist, who published in 1567 “Emblamata liber”; the 1587 edition, illustrated with woodcuts by Tobias Stimmer, is also known as “Aureola Emblemata”. [1, 2] In one of his works there is a self-portrait as well.
Emblema 57 shows a snail in the forest. The German text reads: Eign Herd/ Golds werd/sein Hauss auff Erd / Als dSchneck jeder hab lieb und wert [libearally translated here as: Your own place is golden, with a house on earth, like the snail everybody can love and be valued].
The snail is seen from the left side, with all tentacles, and a somewhat stylised and turrited shell.
 Reusner, N. (1587). Aureolo Emblemata, B. Jobin, Strassburg, 88 ff. http://www.uni-mannheim.de/mateo/camena/reus4/te01.html.