Fig. 339. ENTEROMORPHA CORNUCOPI^E. 
Colour. Dark green below ; pale above. 
Suhstance. Membranaceous ; tbin. 
Character of Frond. Tubular, inflated, bag-like, widening suddenly upwards from a thread- 
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 E. intestincdis, 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. 
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 Enter omorpha ; rather more twisted than in E. Ralfsii; 
simple and unbranched, or bearing (rarely) a few short, slender, spine-like branchlets. 
Measurement. Several inches long. Two or more (but generally only two) cells forming its 
almost hairsbreadth width. The cells small (compared with those of E. 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 unbranched, or bearing a few 
short, slender, spine-like branchlets. 
Measurement. Several inches long. From 2 to 4 cells forming its almost hairsbreadth 
width ! The cells large (compared to those of E. percursa) ; oblong, transparent ; 
each containing a central grain of bright green colouring matter {endochrome). 
Fructification. As before. 
Habitat. On muddy sea-shores above half-tide level. Mr. Kalfs. 
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 E. Balfsii the endochrome 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. 
