PLATE III. 



Udotea argentea f. typica. Two separate lateral appendage oi fi| , •.'■ ),'-'• These are exceptional 

 in tlicir simple form and in their flattened apex; the normal form is lobate and usually embossed 

 . . The thickened rim in the upper figure is an erroneous representation. 

 .'?. U. verticillosa. •!■ Filament of frond, shewing numerous cl<>- ( verticils of spinose lateral appen- 

 ,cs. />. single lateral appendage, twice forked and having acute apices 472. 

 i --4. U. papillosa. Pilaments of frond. a. lateral view, shewing papillac in profile arranged pair-wise 

 front and back ■ 17S. /;. surface view ol same papillae foreshortened, being seen from above 

 17S. ,-. .nul ./. Papillae enlarged, mamillate <>v obtuse, 472. 

 1. ('. argentea var. spumosa. Filament of stipes, uith lateral appendages 83. 

 Fig. j;/'. and c. U. verticillosa. />. Filament of stipes with lateral appendages 83; e. lateral appendage, 

 wit li characteristic thick wall, 47-. 

 U. flabellum Huw,-. Habit ut' plant. (Guanico, Porto Rico, Herb. Hauck) nat. size. 

 i 27. Ditto. a. Filament of frond with digitate lateral appendages of unequal length (Grenada, Murray) 



N5: /'. ultimate division of lateral appendage with bifid, truncate apices 472. 

 I Ditto 1. Filament of stipes with lateral appendages 83; />. ultimate divisions of a lateral 



appendage with obtuse thick-walled apices 472. 



