There were quite a few of them scattered around the east coast and eastern Canada in the 60's, along with Sharks, B-Lions, et al. The Shark and Cougar were imported. I know the Shark originated in the U.S. from England and then Dick Gibbs began from Michigan began building them.
While the present Cougar Cat is now in Australia(see their site at http://cougarcatamarans.com/, although not sure it is the same Cougar), it was actually imported from England.

Back in 1950 when other boat builder were content with conventional designs, Roland and Francis Prout of Canvey Island, Essex, England, began to apply twin-hull thinking to boats.
Their first design was the Shearwater in 1952. How about that? It was a 16.5' and was one of the largest classes, next to the Shark, and had around 1000 boats by the mid-60s.

Then came the new and updated cat, The Cougar Mark I, They sailed it in the 1959 Yachting "One-of-a-Kind" race at Miami and won the Class B and took second overall.
Cougar Mark III was next. It was an 18'9" Cat.

It seems like the designs in those days were pretty similar. And you are right.., it does look a bit like a Shark Catamaran.

Mary actually has in her file a newsletter from December 1975 called "Cougar Talk" that was published by the Intl Cougar Catamaran Assn.

Rick