Fig. 339. ENTEROMORPHA CORNUCOPIiE. 



Colour. Dark green below; pale above. 

 Substance. Membranaceous; thin. 



Character of Frond. Tubular, inflated, ba^^-like, widening suddenly upwards from a 

 thead-like base; by degrees spreading at top like a funnel, and finally torn 

 and open. 



Measurement. About an inch high. 



Fructification. Minute seeds (zoospores) formed of the colouring matter in the cells 

 of which the frond-membrane is composed, and in due time bursting 

 through them. 



Habitat. On corallines in rocky pools left by the tide. Not " generally observed." 



So very like a dwarf variety of F. intestinalis, that Dr. Harvey hesitates 

 about it. The species was constituted by a well-known algologist now dead, 

 and for the present stands. 



Fig. 340. ENTEROMORPHA PERCURSA. 



Colour. Bright grass-green; fading when dry. 

 Substatice. Membranaceous; soft. 



Character of Frond. Entangled tufts of very slender (almost hair-like) threads 

 {filaments) spreading widely on oozy shores. Filaments nearly solid, but just 

 tubular, so as to keep up the character of an Fnteromorplia ; rather more 

 twisted than in F. Balfsii; simple and unbranched, or bearing (rarely) a few 

 short, slender, spine-like branchlets. 



3feasurement. Several inches long. Two or more (but generally only two) cells 

 forming its almost hairsbreadth width. The cells small (compared with those 

 of F. Ralfsii); square; the colouring matter {endochrome) nearly filling them, 

 and being subdivided into four infinitesimal portions. 



Fructification. As before. 



Habitat. On muddy sea shores above half-tide level. 



These last two figures are misplaced on the plate. 



Fig. 341. ENTEROMORPHA RALFSII. 



Colour. Bright grass-green; fading when dry. 

 Substance. Membranaceous; soft. 



Character of Frond. Entangled tufts of very slender (almost hair-like) threads 

 {filaments) spreading widely on oozy shores. Filaments nearly solid, but just 

 tubular; so as to keep up the character of an Enteromorpha\ simple and un- 

 branched, or bearing a few short, slender, spine-like branchlets. 



Measurement. Several inches long. From 2 to 4 cells forming its almost hairs- 

 breadth width! The cells large (compared to those of F. percursa); oblong, 

 transparent; each containing a central grain of bright green colouring mat- 

 ter {endochrome). 



Fructification. As before. 



Habitat. On muddy sea-shores above half-tide level. Mr. Ealfs. 



The characters which separate this plant from E. percursa are microscopic, 

 in more senses than one, as a comparison of the descriptions will show. In 

 F. FaJfsii the endoclirome forms a minute dot in the centre of a transparent 

 cell; in E. percursa it is a square mass, and nearly as large as the cell itself. 

 See Figs. 340 and 341. 



70 



