 Besides suppositio naturalis, Peter’s (and other medievals’) conception of suppositio simplex also seems to hover between connotation and denotation. In the expression homo est species the term homo has suppositio simplex, but this is precisely too what the term homo signifies. So there scarcely seems reason to separate signification from supposition on this score. The specific use of suppositio simplex found in Peter of Spain and other medieval authors, as the representation of a universal nature, is rejected later on by authors such as William of Ockham. For the latter, the term homo in the example just given has suppositio simplex (for Ockham a special case of suppositio materialis) in that it stands for the mental concept of man (Kneale &amp; Kneale 1978, pp. 268–269).