72 ALG^E. 



small green jelly-like masses, adhering to sticks and 

 stones in water. These consist of branched filaments 

 (PL V. fig. 10), prolonged at the ends into colourless 

 hair-like points, and composed of single rows of cells, 

 the green endochrome forming a band across the 

 middle of each cell, the ends being colourless. 



In Coleochdte scutdta (PL V. fig. 14) the cells are 

 closely united, so as to form a minute flat green disk. 

 In the natural state, this beautiful little object adheres 

 to the submerged leaves and stems of water-plants, 

 and is therefore difficult to be found. But if a few 

 healthy water-plants be kept for some time in a glass 

 jar, the little Coleochcete, which is about as large as 

 a pin's head, will often be found adhering to the side 

 of the glass. 



BAT'RACHOSPEB/MEJE. The members of this family 

 resemble to the naked eye the little masses of Drapar- 

 naldia, and they are found in the same localities. 

 They are of various colours, being green, brown, 

 purple, or red. They consist, as in Bat'rachosper'mum 

 monilifor'me (PL V. fig. 8), of branched filaments, 

 which have a knotty appearance under a low power. 

 The larger filaments are composed of cells arranged 

 end to end, the knots consisting of numerous smaller 

 whorled filaments, i. e. filaments arising from around 

 them at the same level (fig. 7). The cells composing 

 the whorled filaments are beaded or moniliform, and 

 are prolonged into colourless hair-like points. The 

 globules seen among the branches (fig. 7) consist of 

 groups of spores. 



ZYGNEMA'CEVE. The members of this family re- 

 semble the Confervacese in consisting of simple cel- 

 lular filaments (Pl.V.figs.ll, 13), but differ from them 

 in the elegant arrangement of the endochrome : this 

 forms beautiful spiral bands, as in Spirog'yra quini'na 

 (fig. 11), or star-shaped masses, as in Zy grid ma cru- 

 cia'ta (fig. 13). A remarkably curious phenomenon 

 met with in them is the manner in which the spores are 



