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Click Google+ and you will be taken to a page with your icon and two little check boxes along with misc. google+ stuff. This is your Google+ setting page. If you are operating under a blogger profile you won't see this page.
To vanquish Google+ comments, uncheck the second box (the one on the right I circled in red). Now you are back to blogger comments and you can control those by going to settings - post and comments.
Here's a look at one of my posts with a lot of facebook comments...