What are those braids called that Bo Derek had in the 70s? dreads or cornrows or braids?

see this hair:

http://www.folklore.org/projects/Macintosh/images/bo_derek.jpg

what are these?

are these cornrows or braids or dreads?

i wanna get this done but does it take long to do? is it bad for your hair? what are the little shell things she has in her hair? has anyone had this done b4?
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