REST Query to Get Content Type Name

I'm just getting started learning to use the SharePoint REST interface.  One of the first things I'd like to do is return the content type name for a list item in a document library (the document library is configured with several content types).  From what I've read, it looks like I need to use the $expand query option.  So, my REST query looks like this:

http://localhost/_api/web/lists/Documents/Items()?&$select=ContentType/Name&$expand=ContentType/Name

But it's not working.  I can't "dig" out the content type name property.  In other words the $expand query option is not working.  I just receive the following which includes a link to the content type: 

  <entry m:etag="&quot;2&quot;">

    <id>4078e129-ac4b-44b8-b469-bcc083f2268d</id>
    <category term="SP.Data.DocumentsItem" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme" />
    <link rel="edit" href="Web/Lists(guid'cd710fd1-057e-4ee7-b0bd-1f014218ea3e')/Items(36)" />
    <link rel="http://schemas.microsoft.com/ado/2007/08/dataservices/related/ContentType" type="application/atom+xml;type=entry" title="ContentType" href="Web/Lists(guid'cd710fd1-057e-4ee7-b0bd-1f014218ea3e')/Items(36)/ContentType" />
    <title />
    <updated>2013-04-12T00:16:26Z</updated>
    <author>
      <name />
    </author>
    <content type="application/xml" />
  </entry>

I've tried difference variations and if I just use "$expand=ContentType" then I get all the list items with the content type fully expanded within each item.

What am I missing?