Option 1: A barrier reef is a long, narrow coral reef situated parallel to the shore, but separated from it by a lagoon or channel. It is not circular or elliptical in shape and does not enclose a lagoon. Therefore, option 1 is not the correct answer.

Option 2: Anatoli is not a term used to describe a type of coral reef. This option does not provide a correct answer.

Option 3: A coral dune is a mound of coral debris that forms a sand dune shape. It is not circular or elliptical and does not enclose a lagoon. Therefore, option 3 is not the correct answer.

Option 4: A coral fringe is a type of coral reef that runs parallel to the coast and is often found close to the shoreline. It does not typically enclose a lagoon. Therefore, option 4 is not the correct answer.

Based on the options provided, the correct answer is option 2. However, it is important to note that "Anatoli" is not a commonly used term to describe a type of coral reef.