232 SEAWEEDS 
The Geographical Distribution is well marked. 
Nitophyllum, Delesseria, and Hydrolapathum, the 
British genera, are widely represented, the two former 
in southern warm temperate seas as well as in the 
north. Clawdea elegans occurs in Tasmania, and one 
small inconspicuous species, C. multifida, in Ceylon. 
Martensia occurs in South Africa, and Grinnellia is 
Fic. 75.—Martensia elegans reduced. 
confined to the Atlantic shores of North America. 
Delesseria Amboinensis 18 a singular freshwater form 
occurring in running streams at a considerable 
elevation above sea-level in Amboyna. 
Bonnemaisontee. 
This small family includes for the most part forms 
with long slender main shoots clothed with fine 
filamentous branches. The procarpia are situated in 
