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tokens: We thank the referee, Dennis Zaritsky, for a thoughtful review that led us to broaden the scope of this paper. We also thank Matt Bershady and Rob Swaters for conversations about the DiskMass project. This work is based in part on observations made with the Spitzer Space Telescope , which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Other aspects of this work were supported in part by NASA ADAP grant NNX11AF89G. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.