Hope this clears it up - it's a minor connector cum indirect retainer
Another connector (sometimes referred to as a 'Kennedy Bar' or continuous clasp) consists of a dental bar, combined with a lingual bar. This combination allows the dimensions of each component to be reduced to a limited extent without compromising the overall rigidity of the connector. However, this is a relatively complex design and is best avoided if any of the simpler alternatives are feasible. Tolerance of the patient must be assessed carefully before prescribing either a dental bar or a lingual bar and continuous clasp.
Ref BDJ
From the following article
Prosthetics:
Connectors
J C Davenport, R M Basker, J R Heath, J P Ralph, P-O Glantz & P Hammond
British Dental Journal 190, 184 - 191 (2001) Published online: 24 February 2001
doi:10.1038/sj.bdj.4800919