SECT. 3] 



SHALLOW-WATER CARBONATE SEDIMENTS 



557 



Fig. 2. Segments and branches. 



A. Segmented green algae. Left, Halimeda tridens; middle, Cymopolia sp.; right, 

 Halimeda opuntia. 



B. Segmented red algae. Top, Amphiroa sp.; bottom, Jania sp. 



C. Two ophiviroids and their segments. 



D. The branching red alga Goniolithon strictum and its fragments. 



E. The branching coral Porites divaricata and its fragments. 



F. Underwater view of the bladed branches of the hydrocoral Millepora. (Photograph 

 by Eugene Shinn.) 



G. The branching coral Acropora cervicornis. (Photograph by Eugene Shinn.) 



blade-shaped branches or projections, such as those of other species of corals, 

 hydi'ocorallines, red algae and bryozoans (Fig. 2F). 



Almost all of these branched forms are sufficiently well calcified that they 

 do not disintegrate when the plant or animal dies. However, by reason of the 



