Petrus Lombardus is the author of this manuscript in the Bibliothèque Municipale in Troyes (France). The theological document is entitled “Sententiae”, and is written in Latin; it was made during the second half of the 13th century in France. [1, 2] The are also editions known of “this most influential schoolbook of the Middle Ages” that have been illuminated with decorated initials and originated in southern Germany .
In the marginalia of this text, uncoloured drawings have been made in a very peculiar style. On folio 56v a stylised snail is seen from above, with a dextral shell, two pointed tentacles, and two eyes with eye-lids. It is placed on a structure that reminds me of a drainpipe.
Did I say before that those medieval illuminators surely had a sense of humor?
 BM Troyes, Ms. 0145, 70 ff. http://bit.ly/1fsMz5x (27.ii.2014).