I have used an image of XXL magazine from Google Images and annotated it using Adobe Photoshop.
Masthead:
The masthead is the title or logo of the magazine usually found in the top left hand side of the magazine but can also be found along the top of the magazine filling the width of the page.
Essential Information:
The essential information generally consists of the price of the magazine, the issue number and the date of the issue.
Main Coverline:
The main coverline is normally related to the cover page image and eludes to the main story.
Subheading:
The subheading is used to explain the main coverline in more detail and give the reader an idea of what the main story or article is going to be about.
Coverlines:
Coverlines are used to convey the other stories that will be included in the issue or which artists/actors are included in the issue.
Barcode:
The barcode is used so that the magazine can be bought from a retailer.