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occurring throughout the Mediterranean region, T. iaquetii in 

 Korean waters and the China Sea, R. ohtusa and R. fili folia in the 

 waters adjacent to Patagonia, R. anomala in the Caribbean, 

 R. cirrhosa in Italian waters, and R. occidentalis, R. curvicarpa, 

 and R. pectinata in the waters of the Pacific along the shores of 

 western North America. Some of the species of this genus are able 

 to grow also in fresh water and may ascend rivers far beyond the 

 area of tidal influence. On the western coast of North America, 

 is also the strange genus Phyllospadix with two known species : 

 P. scoulcri ranging from Vancouver Island and British Columbia 

 south to Santa Barbara and other parts of California, and P. torreyi, 

 known only from Calif ornian waters. The latter is used extensively 

 as fireproofing and deadening in filling between the walls of build- 

 ings. A peculiar monotypic genus is the genus Enalns, represented 

 by E. acoroides in the waters of the Indian and western Pacific 

 Oceans. 



In the Mediterranean Sea and the waters adjacent to the Iberian 

 Peninsula is found Posidonia oceanica. The only other known species 

 of this genus, P. australis, inhabits the waters of extra-tropical 

 Australia, Tasman Sea, and the Antarctic Ocean. The genus 

 Halophila is widely distributed: H. ovalis in the Indian Ocean and 

 South Seas, H. stipulacea and H. heccarii in the Indian Ocean and 

 other waters adjacent to tropical Asia, H. spinidosa in the Japan 

 Sea, Yellow Sea, and China Seas, through the South Seas, to the 

 Coral Sea off northern Australia, and H. baiUonis in the Caribbean. 



The genus Halodule [Diplanthera] is known from three 

 species : H. wrightii inhabits the waters of the Gulf of Mexico and 

 Caribbean Sea, H. australis the Red Sea, and H. uninervis the Indo- 

 Pacific Oceans. The genus Amphiholis is also represented by three 

 species : A. ciliata in the waters of the Indo-Pacific Oceans and 

 A. bicornis and A. antarctica in the Antarctic Ocean and Tasman 

 Sea adjacent to Australia. 



Probably the largest genus of marine phanerogams is the genus 

 Cymodocea. One species, C. manatorum, known as "manatee- 

 grass", inhabits the waters of the Gulf of Mexico and Caribbean 

 Sea and may be looked for off the coasts of the southern United 

 States and the West Indies. It is entirely marine and is seldom seen 

 except when dredged up during dredging operations in bays or 

 harbors or when washed ashore after storms. It is said to be a 



