Probably means Catalina 350
The specs are here
http://www.catalinayachts.com/yachts.cfm?act=model&id=48&link=spec
Its listed as 36' 5" overall length & 35' 3" for the Hull .
Unlike most other Sailboat manufacturers Catalina doesn't overstate the length of the boat in their model #'s. They list their boats as less than overall length