APUANIZOMEKON. 279 



cimens of what I had presumed to be this plant in all its 

 stages (i. e. from its first to its last appearance as a colouring 

 matter), I was much pleased to have the conjecture verified 

 by microscopical examination. A portion taken from the 

 surface when it a2:>peared pale green v/as, under the mi- 

 croscope, of as dark a hue as in July, whilst the blue and fer- 

 ruginous colours exhibited different stages of decomposition. 

 When in the most perfect state in which the plant has 

 occurred to me, the globules appear entirely filled with 

 granules ; but when very highly magnified are each found to 

 be surrounded by a hyaline membrane. The blue and ferru- 

 ginous tufts exhibited generally its empty globules and the 

 escaped granules scattered all about; but the former were 

 seen in every state from fidl to empty ; some had granules 

 only in the centre, others were half full, and some separate 

 globules were entirely filled with the granular mass. 



" When two of the spiral portions come in contact, they 

 have an elastic power, by which they can, though slowly, 

 disentangle themselves and separate from each other, a fact 

 which I witnessed in various instances ; but under such cir- 

 cumstance only did I ever perceive any motion in this Alga.^^ 



" In some respects the Anah. spiralis resembles the Anab. 

 impalpabilis Bory, as described in the " Encyclopedic Metho- 

 dique ; " but its dull green unlustrous hue on paper is quite 

 opposed to that of the species just named, which is described — 

 Preparee sur le papier, ou on a facilite son developpement, 

 elle est de la teinte la plus brillante, tirant sur celle de I'oxide 

 du cuivre, et luisant comme si on Ferut enduite d'eau de 

 gomme." Besides, w^ere this species of the exact spiral form 

 of that under consideration, this character would not I con- 

 ceive have been unnoticed in the description." — Thompson, 



33. APHANIZOMENON Morren. 



Char. '* Filaments 5?mp/e, cylindrical, flexile^ membranaceous, 

 glossy, articulated, cohering together in flat lamellcR, lance- 

 olated at the apex, straight, or here and there inflated, full 

 of green matter, oscillating spontaneously, falling into 

 pieces.'''' — Morren. 



T 4 



