Yolande of Flanders (1326–1395) married in 1353 to Philippe of Navarre and received as present for here marriage a Book of Hours, which is now in the British Library, London . This manuscript, which probably originated in Paris between 1353 and 1363, contains a snail in the marginalia on folio 31r.
The scene is another variation on the ‘knight v. snail’ theme. Here the knight seems to be not hostile but to adore the snail, which is dextral, with four tentacles, its foot folded, but lacking its tail.
 BLL, inv. Ms. Yates Thompson 27, 138 ff. http://bit.ly/1sbGhih.